genus Sialis vs arthropod genus

genus Sialis and arthropod genus both are nouns.

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

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

genus Sialis (noun)	arthropod genus (noun)
type genus of the Sialidae	a genus of arthropods