genus Vernonia vs Compositae

genus Vernonia and Compositae both are nouns.

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

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