genus Cancer vs arthropod genus

genus Cancer and arthropod genus both are nouns.

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

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

genus Cancer (noun)	arthropod genus (noun)
type genus of the family Cancridae	a genus of arthropods