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Bulgarian Ukrainian
53 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 Bulgarian and Ukrainian
WordIn EnglishBulgarianUkrainian
добреbg [doˈbrɛ]uk [ˈdɔbre]well#25#47
там[tam]there#78#43
точноbg [ˈtɔt͡ʃno]uk [ˈtɔt͡ʃnɔ]exactly, precisely, accurately#102#146
безbg [bɛs]uk [bɛz]without#109#99
триbg [tri]uk [trɪ]three#215#169
мамоbg /ˈmamo/uk [ˈmamɔ]vocative singular of ма́ма#230#330
дваbg [dva]uk [ˈdʋa]two#273#140
брат[brat]brother#274#269
ясноbg [ˈja̟sno]uk [ˈjasnɔ]clearly#276#245
моментbg [moˈmɛnt]uk [mɔˈmɛnt]moment, instant#300#488
сестраbg [sɛˈstra]uk [seˈstra]sister#348#525
надbg [nat]uk [nad]above, over#353#232
де[dɛ]where#358#69
синbg [sin]uk [sɪn]son#399#345
план[pɫan]plan, scheme#554#432
вашеbg [ˈvaʃɛ]uk [ˈʋaʃe]your, yours#603#361
вашаbg [ˈvaʃɐ]uk [ˈʋaʃɐ]your, yours#704#189
раноbg [ˈrano]uk [ˈranɔ]early#714#627
групаbg [ˈɡrupɐ]uk [ˈɦrupɐ]group#762#1,556
абсолютноbg [ɐpsoˈlʲu̟tno]uk [ɐbsoˈlʲutnɔ]absolutely#773#562
системаbg [siˈstɛmɐ]uk [seˈstɛmɐ]system#795#1,282
тихоbg [ˈtixo]uk [ˈtɪxɔ]quietly#807#518
музикаbg [ˈmuzikɐ]uk [ˈmuzekɐ]music#817#1,218
книгаbg [ˈkniɡɐ]uk [ˈknɪɦɐ]book#821#1,154
телефонbg [tɛlɛˈfɔn]uk [teɫeˈfɔn]telephone#874#500
президентbg [prɛziˈdɛnt]uk [prezeˈdɛnt]president#891#1,008
шоуbg [ˈʃɔw]uk [ˈʃɔʊ]show#910#797
славаbg [ˈsɫavɐ]uk [ˈsɫaʋɐ]glory#926#747
чайbg [t͡ʃa̟j]uk [t͡ʃai̯]tea#941#1,061
геройbg [ɡɛˈrɔj]uk [ɦeˈrɔi̯]hero#954#1,369
виноbg [ˈvino]uk [ʋeˈnɔ]wine#987#1,198
сезонbg [sɛˈzɔn]uk [seˈzɔn]season#1,063#966
клубbg [kɫup]uk [kɫub]club#1,090#1,317
мирbg [mir]uk [mɪr]peace#1,095#561
наш[naʃ]our, ours#1,146#179
половинаbg [poɫoˈvinɐ]uk [pɔɫɔˈʋɪnɐ]half#1,148#1,674
окоbg [oˈkɔ]uk [ˈɔkɔ]eye#1,224#1,525
наша[ˈnaʃɐ]our, ours#1,275#312
генералbg [ɡɛnɛˈraɫ]uk [ɦeneˈraɫ]general#1,276#1,740
костюмbg [koˈstʲu̟m]uk [koˈsʲtʲum]suit#1,299#1,193
тест[tɛst]test#1,346#1,572
вашbg [vaʃ]uk [ʋaʃ]your, yours#1,351#191
принцbg [print͡s]uk [prɪnt͡s]prince#1,430#1,615
ключbg [klʲu̟t͡ʃ]uk [klʲut͡ʃ]key#1,483#828
рак[rak]crawfish, crayfish#1,523#1,709
сто[stɔ]hundred#1,566#847
професорbg [proˈfɛsor]uk [prɔˈfɛsɔr]professor#1,571#1,695
урокbg [oˈrɔk]uk [ʊˈrɔk]lesson#1,653#1,285
мак[mak]poppy#1,729#1,441
звукbg [zvuk]uk [zwuk]sound#1,755#1,041
правилоbg [ˈpraviɫo]uk [ˈpraʋeɫɔ]rule#1,757#1,415
майор[mɐˈjɔr]major#1,787#1,880
закон[zɐˈkɔn]law#1,835#1,205

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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