Compositae vs genus Helianthus

Compositae and genus Helianthus both are nouns.

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

Compositae (noun)	genus Helianthus (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	genus of tall erect or branched American annual or perennial herbs with showy flowers: sunflowers