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Catalan Italian
25 of the 2,000 commonest words in each are the same — 1% 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 Catalan and Italian
WordIn EnglishCatalanItalian
vaca [ˈba]it /ˈva/to go#18#63
tuca [ˈtu]it /ˈtu/you; thou#33#38
oca [ˈo]it /ˈɔ/or#65#68
faca [ˈfa]it /ˈfa/ago#81#102
maica [ˈmaj]it /ˈma.i/never#85#66
sempreca [ˈsem.pɾə]it /ˈsɛm.pre/always#125#118
ohca /ˈɔ/it /ˈo/oh#173#59
teca [ˈte]it /te/you, thee#189#45
problemaca [pɾuˈβlɛ.mə]it /proˈblɛ.ma/problem#269#259
pensavaca /pənˈsaβə/it /penˈsa.va/to think#299#1,766
pensoca [ˈpɛn.su]it /ˈpɛn.so/to think#341#184
nordca [ˈnɔrt]it /ˈnɔrd/north#443#1,264
pensaca [ˈpɛn.sə]it /ˈpɛnsa/to think#481#473
papaca [ˈpa.pə]it /ˈpa.pa/pope#485#396
mortaca [ˈmɔr.tə]it /ˈmɔr.ta/dead#647#580
significaca [siŋ.niˈfi.kə]it /siˈɲifika/to mean, to signify#684#426
sudca [ˈsut]it /ˈsud/south#789#1,355
clubca /ˈklup/it /ˈklab/club#950#1,102
curaca [ˈku.ɾə]it /ˈku.ra/care#953#647
causaca [ˈkaw.zə]it /ˈkaw.sa/cause#976#616
finestraca [fiˈnes.tɾə]it /fiˈnɛs.tra/window#1,100#1,390
bombaca [ˈbom.bə]it /ˈbom.ba/bomb#1,179#1,287
testimonica [təs.tiˈmɔ.ni]it /testiˈmɔnɪ/witness#1,306#1,941
teoriaca /teuˈɾiə/it /te.oˈri.a/theory#1,449#1,792
pagaca [ˈpa.ɣə]it /ˈpa.ɡa/to pay#1,582#1,684

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 Catalan (upc_ona (ca_ES), CC BY-SA 4.0).

The overlap is the easy part.

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

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