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Croatian Czech
54 of the 2,000 commonest words in each are the same — 3% 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 Croatian and Czech
WordIn EnglishCroatianCzech
nehr /ne/cs [ˈnɛ]not#3#13
sehr /se/cs [ˈsɛ]myself#4#2
onhr /ôːn/cs [ˈon]he#49#121
onahr /ǒna/cs [ˈona]she#82#209
onohr /ǒno/cs [ˈono]it#128#640
onihr /ǒni/cs [ˈoɲɪ]they#130#384
dvahr /dʋâː/cs [ˈdva]two#165#153
živothr /ʒǐʋot/cs [ˈʒɪvot]life#171#179
ženahr /ʒěna/cs [ˈʒɛna]woman#222#350
sebehr /sêbe/cs [ˈsɛbɛ]myself#257#251
jednahr /ˈjednɐ/cs [ˈjɛdna]one#281#327
autohr /ǎuto/cs [ˈau̯to]car, automobile#326#379
stohr /stôː/cs [ˈsto]hundred#347#1,562
osobahr /ôsoba/cs [ˈosoba]person#444#1,214
ženuhr /ˈʒɛnʊ/cs [ˈʒɛnu]woman#458#595
očihr /ˈotʃɪ/cs [ˈot͡ʃɪ]eye#463#554
smrthr /smr̩̂t/cs [ˈsmr̩t]death#525#633
šesthr /ʃêːst/cs [ˈʃɛst]six#542#638
sestrahr /sěstra/cs [ˈsɛstra]sister#590#753
desethr /dêset/cs [ˈdɛsɛt]ten#611#669
doktorhr /dôktor/cs [ˈdoktor]doctor, physician#768#612
voduhr /ˈvodʊ/cs [ˈvodu]water#808#962
našihr /ˈnaʃɪ/cs [ˈnaʃɪ]our, ours#822#560
autahr /ˈaʊtɐ/cs /ˈaʊta/car, automobile#860#608
okolohr /ôkolo/cs [ˈokolo]around#885#1,089
nadhr /nâd/cs [ˈnat]over, above#893#452
pivohr /pîːʋo/cs [ˈpɪvo]beer#906#1,045
vodahr /ʋǒda/cs [ˈvoda]water#934#1,122
prstenhr /pr̩̂steːn/cs [ˈpr̩stɛn]ring#1,053#1,481
očimahr /ˈotʃɪmɐ/cs [ˈot͡ʃɪma]eye#1,061#1,761
detektivhr /ˈdɛtɛktɪv/cs [ˈdɛtɛktɪf]detective#1,077#1,279
čajhr /t͡ʃâj/cs [ˈt͡ʃaj]tea#1,081#1,272
klubhr /klûːb/cs [ˈklup]club#1,085#1,861
zlatohr /zlâːto/cs [ˈzlato]gold#1,086#313
testhr /têst/cs [ˈtɛst]test#1,095#1,322
hotelhr /xǒtel/cs [ˈɦotɛl]hotel#1,134#1,810
ulicehr /ˈulit͡sɛ/cs [ˈulɪt͡sɛ]street#1,209#1,500
zvukhr /zʋûːk/cs [ˈzvuk]sound#1,225#1,520
dolehr /dôle/cs [ˈdolɛ]down#1,244#689
školahr /ʃkôːla/cs [ˈʃkola]school#1,247#1,439
vlakhr /ʋlâːk/cs [ˈvlak]train#1,269#1,640
obahr /ôba/cs /oba/both#1,280#437
zločinhr /zlǒt͡ʃin/cs [ˈzlot͡ʃɪn]crime#1,287#1,609
kontakthr /kǒntakt/cs [ˈkontakt]contact#1,307#1,612
rosehr /ˈrosɛ/cs [ˈrosɛ]dew#1,435#1,776
pozornosthr /pozǒːrnoːst/cs [ˈpozornost]attention#1,481#1,184
parkhr /pârk/cs [ˈpark]park#1,493#1,942
bombahr /bôːmba/cs [ˈbomba]bomb#1,511#1,722
trikhr /trîk/cs [ˈtrɪk]trick#1,519#1,976
dušehr /ˈduʃɛ/cs [ˈduʃɛ]soul#1,543#1,142
prostorhr /prǒːstor/cs [ˈprostor]space#1,593#1,784
projekthr /prǒjekt/cs [ˈprojɛkt]project#1,804#1,935
stanicehr /ˈstanɪtsɛ/cs [ˈstaɲɪt͡sɛ]station#1,831#1,809
minuthr /mǐnuːt/cs [ˈmɪnut]minute#1,985#406

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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