Body

heart

Source:*sьrdьceProto-Slaviccertain

I knowI'm learning

English

heart

Polish

serce

ˈsɛrtsɛ

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

In all five languages

BCS script

Latin under Cyrillic

Russian
се́рдцеserdce
ˈsʲertsəinherited
The д is written but not pronounced.
Ukrainian
се́рцеserce
ˈsɛrtsɛinherited
Polish
serce
ˈsɛrtsɛinherited
Czech
srdce
ˈsr̩tsɛinherited
Bosnian-Croatian-Serbian
srceсрце
ˈsr̩tseinherited
English
heart
Distant English relative — Heart, Latin cor and Slavic *sьrd- share an Indo-European root (*ḱerd-).