Compositae vs genus Pteropogon

Compositae and genus Pteropogon both are nouns.

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

Compositae (noun)	genus Pteropogon (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	genus of Australian and South African herbs including some from genus Helipterum