family Cruciferae vs genus Aethionema

family Cruciferae and genus Aethionema both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Cruciferae	Yes	No	No	No
genus Aethionema	Yes	No	No	No

family Cruciferae (noun)	genus Aethionema (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives	Old World genus of the family Cruciferae