genus Rudbeckia vs Compositae

genus Rudbeckia and Compositae both are nouns.

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

genus Rudbeckia (noun)	Compositae (noun)
North American perennial herbs with showy cone-shaped flower heads	plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia