amphibian genus vs genus

amphibian genus and genus both are nouns.

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

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

amphibian genus (noun)	genus (noun)
any genus of amphibians	a general kind of something
	(biology) taxonomic group containing one or more species