Proto-Indo-European *pen-

→ English penetrate (root)

→ English fen (derived)

→ English impenetrable (root)

→ English Pannonia (derived)

→ Irish eanach (derived)

→ Italian Pannonia (derived)

→ Latin penes (mention)

→ Latin Pannonia (derived)

→ Latin penus (mention)

→ Sanskrit पङ्क (derived)