(Old, Middle, Modern) French distinguishes between navet, s.m. meaning ‘turnip’ and navette, s.f. meaning ‘rapeseed’ though both of these plants share the same genus, Brassica with rapeseed known as Brassica napus and turnip is known as Brassica rapa. Napus in medieval Latin can refer to a variety of plants, including wild turnip, wild radish and wild nep and in a similar manner rapa can be used to mean turnip or rape or even parsnip. Anglo-Norman seems only to use navet to refer to ‘turnip’, though it is possible that some of the citations are referencing ‘rape’. See also nef#2 and nefel.