Compositae vs genus Gaillardia

Compositae and genus Gaillardia both are nouns.

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

Compositae (noun)	genus Gaillardia (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	genus of western American hairy herbs with showy flowers