Astacus vs arthropod genus

Astacus and arthropod genus both are nouns.

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

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

Astacus (noun)	arthropod genus (noun)
type genus of the family Astacidae; Old World crayfish	a genus of arthropods