Compositae vs genus Vernonia

Compositae and genus Vernonia both are nouns.

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

Compositae (noun)	genus Vernonia (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	genus of New World tropical herbs or shrubs with terminal cymose heads of tubular flowers