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Czech Slovak
256 of the 2,000 commonest words in each are the same — 13% of either list.

A shared word is not proof of a shared root. Two languages can land on the same spelling by borrowing from a third — that is all tren and bomba are — and a word that looks the same can still be said quite differently. What this list is good for is the head start.

Words identical in Czech and Slovak
WordIn EnglishCzechSlovak
jecs [ˈjɛ]sk /je/to be#3#3
acs [ˈa]sk /a/and#4#6
žecs [ˈʒɛ]sk /ʒe/that#5#8
s/s/with#14#13
tycs [ˈtɪ]sk /ti/you#22#28
z/z/from#23#21
tamcs [ˈtam]sk /tam/there#48#34
mámcs [ˈmaːm]sk /maːm/to have#50#40
budecs [ˈbudɛ]sk /buɟe/to be#55#43
váscs [ˈvaːs]sk /vaːs/you#57#48
takžecs [ˈtaɡʒɛ]sk /taɡʒe/therefore, so#59#45
mács [ˈmaː]sk /maː/to have#60#59
vámcs [ˈvaːm]sk /vaːm/you#62#55
kdecs [ˈɡdɛ]sk /ˈɡɟɛ/where?#70#49
odcs /ot/sk /ˈɔd/from#79#70
mášcs [ˈmaːʃ]sk /maːʃ/to have#83#62
náscs [ˈnaːs]sk /naːs/we#86#71
prosímcs [ˈprosiːm]sk /prɔsiːm/please#91#68
moccs [ˈmot͡s]sk /mɔt͡s/too#92#281
vycs [ˈvɪ]sk /vi/you#94#78
tebecs [ˈtɛbɛ]sk /ˈtʲebe/you#102#169
námcs [ˈnaːm]sk /naːm/we#104#86
ahojcs /aˈɦoj/sk /aˈɦɔj/hello, hi#105#87
mámecs [ˈmaːmɛ]sk /maːme/to have#111#89
chcešcs [ˈxt͡sɛʃ]sk /xt͡seʃ/to want#114#84
dobrýcs [ˈdobriː]sk /dɔbriː/good#131#126
mycs [ˈmɪ]sk /mi/we#139#109
mátecs [ˈmaːtɛ]sk /maːce/to have#140#112
dvacs [ˈdva]sk /dva/two#153#205
budešcs [ˈbudɛʃ]sk /buɟeʃ/to be#159#127
vašecs [ˈvaʃɛ]sk /ˈʋa.ʃe/your, yours#160#212
jedencs [ˈjɛdɛn]sk /jeden/one#169#120
božecs [ˈboʒɛ]sk /bɔʒɛ/god#171#116
bezcs [ˈbɛs]sk /ˈbɛs/without#172#121
dnescs [ˈdnɛs]sk /dɲɛs/today#177#93
životcs [ˈʒɪvot]sk /ʒivɔt/life#179#132
teboucs [ˈtɛbou̯]sk /ˈtʲeboʊ/you#181#138
dobrács [ˈdobraː]sk /dɔbraː/good#184#249
budemecs [ˈbudɛmɛ]sk /buɟeme/to be#194#145
pravducs [ˈpravdu]sk /pravdu/truth#207#151
prácics [ˈpraːt͡sɪ]sk /praːt͡si/work#218#400
prácecs [ˈpraːt͡sɛ]sk /praːt͡se/work#221#291
chcecs [ˈxt͡sɛ]sk /xt͡se/to want#225#161
čascs [ˈt͡ʃas]sk /t͡ʃas/time#232#104
vždyckycs [ˈvʒdɪt͡skɪ]sk /vʒdit͡ski/always#237#1,998
nímcs [ˈɲiːm]sk /ɲiːm/instrumental of on and ono#246#164
dobrécs [ˈdobrɛː]sk /dɔbreː/good#247#136
chcetecs [ˈxt͡sɛtɛ]sk /xt͡sece/to want#252#167
každýcs [ˈkaʒdiː]sk /kaʒdiː/each, every#270#154
noccs [ˈnot͡s]sk /nɔt͡s/night, nighttime#271#163
vášcs [ˈvaːʃ]sk /vaːʃ/your, yours#279#181
problémcs [ˈproblɛːm]sk /prɔbleːm/problem#288#166
faktcs [ˈfakt]sk /fakt/fact#296#253
znamenács [ˈznamɛnaː]sk /znamenaː/to mean#307#194
budetecs [ˈbudɛtɛ]sk /buɟece/to be#308#213
pravdacs [ˈpravda]sk /pravda/truth#309#191
zlatocs [ˈzlato]sk /zlatɔ/gold#313#284
lepšícs [ˈlɛpʃiː]sk /ʎepʃiː/better, comparative degree of dobrý#317#512
oteccs [ˈotɛt͡s]sk /ɔcet͡s/father#325#117
jednacs [ˈjɛdna]sk /jedna/one#327#223
celýcs [ˈt͡sɛliː]sk /t͡seliː/whole#335#178
nášcs [ˈnaːʃ]sk /naːʃ/our, ours#343#218
stálecs [ˈstaːlɛ]sk /staːʎe/always, all the time#344#80
ženacs [ˈʒɛna]sk /ʒena/woman#350#209
mužcs [ˈmuʃ]sk /muʃ/man#351#200
protics [ˈprocɪ]sk /prɔci/against#360#239
pomoccs [ˈpomot͡s]sk /pɔmɔt͡s/help, aid, assistance#362#225
jednocs [ˈjɛdno]sk /jednɔ/one#364#221
vlastnícs [ˈvlastɲiː]sk /ˈvɫastniː/own#386#1,247
celoucs [ˈt͡sɛlou̯]sk /t͡selɔv/whole#388#1,624
matkacs [ˈmatka]sk /matka/mother#416#260
tentocs [ˈtɛnto]sk /tentɔ/this#420#118
včeracs [ˈft͡ʃɛra]sk /ft͡ʃera/yesterday#432#285
pozorcs [ˈpozor]sk /ˈpozor/attention#436#233
obacs /oba/sk /ɔba/both#437#1,805
časucs [ˈt͡ʃasu]sk /t͡ʃasu/time#450#265
srdcecs [ˈsr̩t͡sɛ]sk /sr̩t͡sːe/heart#454#349
zemics [ˈzɛmɪ]sk /zemi/earth#455#415
celécs [ˈt͡sɛlɛː]sk /t͡seleː/whole#464#269
dobroucs [ˈdobrou̯]sk /dɔbrɔv/good#465#1,679
číslocs [ˈt͡ʃiːslo]sk /t͡ʃiːslɔ/number#469#268
vzalcs [ˈvzal]sk /ˈvzaɫ/to take#496#432
novýcs [ˈnoviː]sk /nɔviː/new#501#323
vašics [ˈvaʃɪ]sk /vaʃi/your, yours#529#827
smrti/ˈsmr̩ci/death#540#362
ženycs [ˈʒɛnɪ]sk /ʒeni/woman#549#330
hlavucs [ˈɦlavu]sk /ɦlavu/head#551#351
jedinýcs [ˈjɛɟɪniː]sk /ˈjeɟɪˌniː/only, sole#553#341
očics [ˈot͡ʃɪ]sk /ɔt͡ʃi/eye#554#332
mužics [ˈmuʒɪ]sk /ˈmʊʒɪ/man#555#451
slovocs [ˈslovo]sk /slɔvɔ/word#572#343
syncs [ˈsɪn]sk /sin/son#575#316
domucs [ˈdomu]sk /dɔmu/house#577#338
strachcs [ˈstrax]sk /strax/fear#578#404
čaucs [ˈt͡ʃau̯]sk /ˈt͡ʃau̯/hello, hi#582#395
cestucs [ˈt͡sɛstu]sk /ˈtsestu/road#586#329
ženucs [ˈʒɛnu]sk /ˈʒenu/woman#595#361
novécs [ˈnovɛː]sk /nɔveː/new#602#345
loďcs [ˈloc]sk /ˈɫɔc/ship#610#369
doktorcs [ˈdoktor]sk /dɔktɔr/doctor, physician#612#231
rodinacs [ˈroɟɪna]sk /rɔɟina/family#620#360
držcs [ˈdr̩ʃ]sk /dr̩ʃ/to hold#626#352
chybacs [ˈxɪba]sk /xiba/fault#627#397
synacs [ˈsɪna]sk /sina/son#671#413
dnícs [ˈdɲiː]sk /ˈdɲiː/day#714#373
starýcs [ˈstariː]sk /stariː/old#717#367
hlavycs [ˈɦlavɪ]sk /ɦlavi/head#736#444
sestracs [ˈsɛstra]sk /sestra/sister#753#366
cestycs [ˈt͡sɛstɪ]sk /ˈtsesti/road#756#426
sexcs [ˈsɛks]sk /seks/sex#761#454
manželcs [ˈmanʒɛl]sk /manʒel/husband#771#477
celács [ˈt͡sɛlaː]sk /t͡selaː/whole#788#492
slovacs [ˈslova]sk /ˈslova/word#806#1,278
nohycs [ˈnoɦɪ]sk /nɔɦi/leg#813#473
láskacs [ˈlaːska]sk /laːska/love#814#401
tisíccs [ˈcɪsiːt͡s]sk /cisiːt͡s/thousand#844#561
lodics [ˈloɟɪ]sk /ˈlodʲi/ship#846#636
otázkacs [ˈotaːska]sk /ɔtaːska/question#847#476
cestacs [ˈt͡sɛsta]sk /t͡sesta/road#854#445
volalcs [ˈvolal]sk /vɔlal/to call#865#434
bohucs [ˈboɦu]sk /bɔɦu/god#877#528
chodícs [ˈxoɟiː]sk /xɔɟiː/to go#891#655
horšícs [ˈɦorʃiː]sk /ɦɔrʃiː/worse#896#1,646
šťastnýcs [ˈʃcastniː]sk /ʃcastniː/happy#898#437
otčecs [ˈott͡ʃɛ]sk /ɔt͡ʃːe/father#901#730
novoucs [ˈnovou̯]sk /nɔvɔv/new#908#1,841
sexycs [ˈsɛksɪ]sk /seksi/sex#926#745
šatycs [ˈʃatɪ]sk /ʃati/dress#932#506
vrahcs [ˈvrax]sk /vrax/murderer#933#517
sencs [ˈsɛn]sk /sen/dream#943#531
obchodcs [ˈopxot]sk /ɔpxɔt/trade#944#537
dvakrátcs [ˈdvakraːt]sk /dvakraːt/twice#945#665
ulicics [ˈulɪt͡sɪ]sk /ˈu.ɫi.t͡si/street#947#659
vodycs [ˈvodɪ]sk /ˈvodi/water#951#535
hracs [ˈɦra]sk /ˈɦra/play, game#952#539
hlascs [ˈɦlas]sk /ɦlas/voice#960#541
voducs [ˈvodu]sk /vɔdu/water#962#545
hladcs [ˈɦlat]sk /ɦlat/hunger#978#1,229
zdravícs [ˈzdraviː]sk /zdraviː/health#981#1,829
starécs [ˈstarɛː]sk /stareː/old#984#600
chlapčecs [ˈxlapt͡ʃɛ]sk /xlapt͡ʃe/boy#986#427
novács [ˈnovaː]sk /nɔvaː/new#1,012#630
znovacs [ˈznova]sk /znɔva/again#1,020#251
málocs [ˈmaːlo]sk /maːlɔ/little, few#1,041#621
ženoucs [ˈʒɛnou̯]sk /ˈʒenɔu̯/woman#1,044#584
pivocs [ˈpɪvo]sk /pivɔ/beer#1,045#580
škodacs [ˈʃkoda]sk /ʃkɔda/pity, shame#1,046#624
chlapeccs [ˈxlapɛt͡s]sk /xlapet͡s/boy#1,062#308
koncics [ˈkont͡sɪ]sk /kɔnt͡si/end#1,081#612
divnýcs [ˈɟɪvniː]sk /ɟivniː/strange, odd, surprising#1,082#1,143
okolocs [ˈokolo]sk /ɔkɔlɔ/around#1,089#258
krokcs [ˈkrok]sk /krɔk/step, pace#1,090#581
doktoracs [ˈdoktora]sk /ˈdɔktɔra/doctor, physician#1,091#661
mladýcs [ˈmladiː]sk /mladiː/young#1,097#543
pescs [ˈpɛs]sk /pes/dog#1,116#563
vodacs [ˈvoda]sk /vɔda/water#1,122#602
očícs [ˈot͡ʃiː]sk /ɔt͡ʃiː/eye#1,127#620
chybucs [ˈxɪbu]sk /xibu/fault#1,135#634
dušecs [ˈduʃɛ]sk /duʃe/soul#1,142#890
stranucs [ˈstranu]sk /stranu/side#1,144#685
zemcs [ˈzɛm]sk /zem/earth#1,150#396
buďtecs [ˈbuctɛ]sk /bucːe/to be#1,162#682
bytcs [ˈbɪt]sk /bit/apartment, flat#1,167#465
dnacs [ˈdna]sk /dna/gout#1,176#654
synucs /ˈsinu/sk /sinu/son#1,177#960
vtipcs [ˈfcɪp]sk /fcip/joke#1,191#692
hovnocs [ˈɦovno]sk /ɦɔvnɔ/shit, turd#1,192#567
plnýcs [ˈpl̩niː]sk /pl̩niː/full#1,195#705
bohacs [ˈboɦa]sk /bɔɦa/god#1,204#497
nazdarcs [ˈnazdar]sk /nazdar/hello#1,208#924
hlavacs [ˈɦlava]sk /ɦlava/head#1,212#626
osobacs [ˈosoba]sk /ɔsɔba/person#1,214#552
milýcs [ˈmɪliː]sk /miliː/kind#1,215#593
staršícs [ˈstarʃiː]sk /starʃiː/old#1,224#972
knihucs [ˈkɲɪɦu]sk /kɲiɦu/book#1,251#586
psacs [ˈpsa]sk /psa/dog#1,268#678
čajcs [ˈt͡ʃaj]sk /t͡ʃaj/tea#1,272#701
oheňcs [ˈoɦɛɲ]sk /ɔɦeɲ/fire#1,282#688
cestoucs [ˈt͡sɛstou̯]sk /ˈtsestoʊ/road#1,283#667
vzduchucs [ˈvzduxu]sk /vzduxu/air#1,284#672
zubycs [ˈzubɪ]sk /zubi/tooth#1,288#767
kuscs [ˈkus]sk /kus/piece#1,293#716
volács [ˈvolaː]sk /vɔlaː/to call#1,320#293
víkendcs [ˈviːkɛnt]sk /viːkent/weekend#1,341#652
mladács [ˈmladaː]sk /ˈmɫadaː/young#1,344#744
idiotcs [ˈɪdɪjot]sk /iɟiɔt/idiot#1,360#522
chuťcs [ˈxuc]sk /xuc/taste#1,363#707
krkucs [ˈkr̩ku]sk /kr̩ku/neck#1,377#786
stopcs [ˈstop]sk /stɔp/hitchhiking#1,394#830
knihycs [ˈkɲɪɦɪ]sk /kɲiɦi/book#1,396#631
zlécs [ˈzlɛː]sk /zleː/evil#1,407#232
skrzcs [ˈskr̩s]sk /skr̩s/through#1,416#1,271
stranycs [ˈstranɪ]sk /strani/side#1,419#689
pravýcs [ˈpraviː]sk /praviː/right#1,427#791
zlýcs [ˈzliː]sk /zliː/evil#1,431#405
hlavoucs [ˈɦlavou̯]sk /ɦlavɔv/head#1,434#829
vínocs [ˈviːno]sk /viːnɔ/wine#1,436#783
školacs [ˈʃkola]sk /ʃkɔla/school#1,439#759
prezidentcs [ˈprɛzɪdɛnt]sk /prezident/president#1,442#588
chytrýcs [ˈxɪtriː]sk /xitriː/clever#1,443#1,450

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The speaker plays the voice the LangX app uses for that language — synthesised, not a native speaker, so treat it as a guide.

The overlap is the easy part.

The rest comes from using it with someone who speaks it.

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