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Czech Polish
42 of the 2,000 commonest words in each are the same — 2% 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 Polish
WordIn EnglishCzechPolish
jecs [ˈjɛ]pl /ˈjɛ/to be#3#112
alecs [ˈalɛ]pl /ˈa.lɛ/but#12#15
mics [ˈmɪ]pl /ˈmi/first-person pronoun; I#17#18
ocs /o/pl /ˈɔ/about#19#13
jakcs [ˈjak]pl /ˈjak/how#21#14
tycs [ˈtɪ]pl /ˈtɘ/you#22#32
jakocs [ˈjako]pl /ˈja.kɔ/as#30#199
tamcs [ˈtam]pl /ˈtam/there#48#51
niccs [ˈɲɪt͡s]pl /ˈɲit͡s/nothing#58#50
pocs [ˈpo]pl /ˈpɔ/after#73#25
anics [ˈaɲɪ]pl /ˈa.ɲi/neither, nor, or#95#269
zecs [ˈzɛ]pl /ˈzɛ/alternative form of z#137#63
jedencs [ˈjɛdɛn]pl /ˈjɛ.dɛn/one#169#192
chcecs [ˈxt͡sɛ]pl /ˈxt͡sɛ/to want#225#129
noccs [ˈnot͡s]pl /ˈnɔt͡s/night, nighttime#271#394
okcs [ˈok]pl /ˈɔk/eye#299#164
jednacs [ˈjɛdna]pl /ˈjɛd.na/one#327#463
jednocs [ˈjɛdno]pl /ˈjɛd.nɔ/one#364#421
autocs [ˈau̯to]pl /ˈaw.tɔ/car, automobile#379#1,760
onics [ˈoɲɪ]pl /ˈɔ.ɲi/they#384#213
minutcs [ˈmɪnut]pl /ˈmi.nut/minute#406#362
matkacs [ˈmatka]pl /ˈmat.ka/mother#416#453
syncs [ˈsɪn]pl /ˈsɘn/son#575#606
domucs [ˈdomu]pl /ˈdɔ.mu/house#577#98
autacs /ˈaʊta/pl /ˈaw.ta/car, automobile#608#1,915
synacs [ˈsɪna]pl /ˈsɘ.na/son#671#624
nikomucs [ˈɲɪkomu]pl /ɲiˈkɔ.mu/no one, nobody#782#950
komucs [ˈkomu]pl /ˈkɔ.mu/who#935#1,617
hotelucs [ˈɦotɛlu]pl /xɔˈtɛ.lu/hotel#1,038#1,116
rozkazcs [ˈroskas]pl /ˈrɔs.kas/order, command#1,171#1,546
dnacs [ˈdna]pl /ˈdna/gout#1,176#1,194
synucs /ˈsinu/pl /ˈsɘ.nu/son#1,177#925
osobacs [ˈosoba]pl /ɔˈsɔ.ba/person#1,214#1,055
psacs [ˈpsa]pl /ˈpsa/dog#1,268#1,317
minutycs [ˈmɪnutɪ]pl /miˈnu.tɘ/minute#1,376#1,404
kontaktcs [ˈkontakt]pl /ˈkɔn.takt/contact#1,612#1,606
okocs [ˈoko]pl /ˈɔ.kɔ/eye#1,686#1,278
frankcs [ˈfraŋk]pl /ˈfraŋk/franc#1,725#919
energiics [ˈɛnɛrɡɪjɪ]pl /ɛˈnɛr.ɡji/energy#1,829#1,976
oknocs [ˈokno]pl /ˈɔk.nɔ/window#1,898#1,646
razcs [ˈras]pl /ˈras/one#1,945#146
milioncs [ˈmɪlɪjon]pl /ˈmi.ljɔn/million#1,955#1,898

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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