family Compositae vs genus Serratula

family Compositae and genus Serratula both are nouns.

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

family Compositae (noun)	genus Serratula (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	genus of Old World perennial herbs with spirally arranged toothed leaves