Compositae vs genus Eupatorium

Compositae and genus Eupatorium both are nouns.

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

Compositae (noun)	genus Eupatorium (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	large genus of chiefly tropical herbs having heads of white or purplish flowers