Proteus vs amphibian genus

Proteus and amphibian genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Proteus	Yes	No	No	No
amphibian genus	Yes	No	No	No

As nouns, amphibian genus is a hypernym of Proteus; that is, amphibian genus is a word with a broader meaning than Proteus:

Proteus (noun)	amphibian genus (noun)
type genus of the Proteidae	any genus of amphibians
(Greek mythology) a prophetic god who served Poseidon; was capable of changing his shape at will