Compositae vs genus Grindelia

Compositae and genus Grindelia both are nouns.

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

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