genus Aphis vs arthropod genus

genus Aphis and arthropod genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Aphis	Yes	No	No	No
arthropod genus	Yes	No	No	No

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

genus Aphis: type genus of the Aphididae: injurious to fruit trees and vegetables
arthropod genus: a genus of arthropods

genus Aphis (noun)	arthropod genus (noun)
type genus of the Aphididae: injurious to fruit trees and vegetables	a genus of arthropods