genus Gnaphalium vs Compositae

genus Gnaphalium and Compositae both are nouns.

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

genus Gnaphalium (noun)	Compositae (noun)
large widely distributed genus of coarse hairy herbs with whitish involucres	plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia