Compositae vs genus Ambrosia

Compositae and genus Ambrosia both are nouns.

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

Compositae (noun)	genus Ambrosia (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	comprising the ragweeds; in some classification considered the type genus of a separate family Ambrosiaceae