Proto-Indo-European *h₃érsos

→ English ass (inherited)

→ English arse (inherited)

→ English anuran (derived)

→ Middle English ars (inherited)

→ Irish earr (inherited)

→ Irish anúra (derived)

→ Ancient Greek οὐρά (derived)

→ Icelandic rass (derived)

→ Dutch aars (derived)

→ Norwegian Nynorsk rass (derived)