genus Dahlia vs family Compositae

genus Dahlia and family Compositae both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Dahlia	Yes	No	No	No
family Compositae	Yes	No	No	No

genus Dahlia (noun)	family Compositae (noun)
genus of perennial tuberous plants of Mexico and Central America	plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia