family Compositae vs genus Carduus

family Compositae and genus Carduus both are nouns.

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

family Compositae (noun)	genus Carduus (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	genus of annual or perennial Old World prickly thistles