Compositae vs genus Ageratina

Compositae and genus Ageratina both are nouns.

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

Compositae (noun)	genus Ageratina (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	annual to perennial herbs or shrubs of eastern United States and Central and South America