Compositae vs genus Olearia

Compositae and genus Olearia both are nouns.

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

Compositae (noun)	genus Olearia (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	large genus of Australian evergreen shrubs or small trees with large daisylike flowers