genus Grindelia vs family Compositae

genus Grindelia and family Compositae both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Grindelia	Yes	No	No	No
family Compositae	Yes	No	No	No

genus Grindelia (noun)	family Compositae (noun)
large genus of coarse gummy herbs of western North and Central America	plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia