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Czech Slovenian
40 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 Slovenian
WordIn EnglishCzechSlovenian
necs [ˈnɛ]sl /nɛ́/not#13#2
zacs [ˈza]sl /za/behind#32#12
kdocs [ˈɡdo]sl /ɡdòː/who#64#54
oncs [ˈon]sl /ɔ́n/he#121#92
dvacs [ˈdva]sl /dʋáː/two#153#136
onacs [ˈona]sl /ɔ̀ːna/she#209#135
čascs [ˈt͡ʃas]sl /t͡ʃás/time#232#101
zlatocs [ˈzlato]sl /zlatóː/gold#313#541
onics [ˈoɲɪ]sl /ɔ̀ːni/they#384#246
nadcs [ˈnat]sl /nat/over, above#452#240
koneccs [ˈkonɛt͡s]sl /kɔ̀ːnət͡s/end#499#166
smrtics /ˈsmr̩ci/sl /ˈsmərti/death#540#259
očics [ˈot͡ʃɪ]sl /ˈoːtʃi/eye#554#179
smrtcs [ˈsmr̩t]sl /smə́rt/death#633#251
šestcs [ˈʃɛst]sl /ʃéːst/six#638#292
onocs [ˈono]sl /ɔ̀ːnɔ/it#640#1,524
desetcs [ˈdɛsɛt]sl /dɛséːt/ten#669#308
možnostcs [ˈmoʒnost]sl /mòːʒnɔst/possibility#716#324
sestracs [ˈsɛstra]sl /sɛ̀ːstra/sister#753#270
cestacs [ˈt͡sɛsta]sl /t͡sèːsta/road#854#1,028
ulicics [ˈulɪt͡sɪ]sl /ˈulit͡si/street#947#425
pivocs [ˈpɪvo]sl /pìːʋɔ/beer#1,045#417
pescs [ˈpɛs]sl /pə́s/dog#1,116#362
vodacs [ˈvoda]sl /ʋɔ̀ːda/water#1,122#445
radostcs [ˈradost]sl /ràːdɔst/joy#1,149#1,758
pozornostcs [ˈpozornost]sl /pɔzòːrnɔst/attention#1,184#592
čajcs [ˈt͡ʃaj]sl /t͡ʃáːj/tea#1,272#514
ulicecs [ˈulɪt͡sɛ]sl /ˈulit͡sɛ/street#1,500#618
tlakcs [ˈtlak]sl /tláːk/pressure#1,514#1,186
stocs [ˈsto]sl /stóː/hundred#1,562#461
zločincs [ˈzlot͡ʃɪn]sl /zlɔt͡ʃíːn/crime#1,609#609
skupinacs [ˈskupɪna]sl /skupìːna/group#1,622#539
vlakcs [ˈvlak]sl /ʋláːk/train#1,640#534
okocs [ˈoko]sl /ɔkóː/eye#1,686#575
bombacs [ˈbomba]sl /bóːmba/bomb#1,722#653
strojcs [ˈstroj]sl /strɔ́j/machine#1,749#606
mečcs [ˈmɛt͡ʃ]sl /mɛ́t͡ʃ/sword#1,779#596
loscs [ˈlos]sl /lóːs/elk, moose#1,879#667
oknocs [ˈokno]sl /ɔ̀ːknɔ/window#1,898#456
cenacs [ˈt͡sɛna]sl /t͡sèːna/price#1,962#759

The speaker plays the voice the LangX app uses for that language — synthesised, not a native speaker, so treat it as a guide. Voices for Slovenian (artur (sl_SI), CC BY 4.0).

The overlap is the easy part.

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

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