saphenous nerve vs nervus

saphenous nerve and nervus both are nouns.

Word	Noun	Adjective	Verb	Adverb
saphenous nerve	Yes	No	No	No
nervus	Yes	No	No	No

As nouns, nervus is a hypernym of saphenous nerve; that is, nervus is a word with a broader meaning than saphenous nerve:

saphenous nerve: a branch of the femoral nerve that supplies cutaneous branches to the inner aspect of the leg and foot
nervus: any bundle of nerve fibers running to various organs and tissues of the body

Other hypernyms of saphenous nerve include nerve.

saphenous nerve (noun)	nervus (noun)
a branch of the femoral nerve that supplies cutaneous branches to the inner aspect of the leg and foot	any bundle of nerve fibers running to various organs and tissues of the body