Nature

wind

Source:*větrъProto-Slaviccertain

Russian, Ukrainian and BCS grew a vowel to break up the final -тр (ветер, вітер, vjetar); Polish wiatr shows ě turning into a before a hard t.

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English

wind

Polish

wiatr

vjatr

Cognate· distant (Indo-European)Same source — the sound laws connect them.

In all five languages

BCS script

Latin under Cyrillic

Russian
ве́терveter
ˈvʲetʲɪrinherited
Ukrainian
ві́терviter
ˈʋʲitɛrinherited
Polish
wiatr
vjatrinherited
Czech
vítr
ˈviːtr̩inherited
Bosnian-Croatian-Serbian
vjetar / vetarвјетар / ветар
ˈvjetarinherited
English
wind
Distant English relative — Wind and *větrъ are both built on the Indo-European root for 'blow'.