Breton ober

← Proto-Celtic *wregeti (derived)

← Welsh gober (cognate)

← Welsh gwneud (cognate)

← Cornish ober (cognate)

← Cornish gwul (cognate)

← Latin opera (borrowed)

← Old Breton oper (inherited)

→ Welsh gwneud (cognate)

→ Cornish gul (cognate)

→ Cornish gwul (cognate)