genus Picris vs Compositae

genus Picris and Compositae both are nouns.

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

genus Picris (noun)	Compositae (noun)
genus of weedy Old World yellow-flowered herbs usually containing a bitter-tasting substance: bitterweed	plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia