family Compositae vs genus Petasites

family Compositae and genus Petasites both are nouns.

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

family Compositae (noun)	genus Petasites (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	genus of rhizomatous herbs of north temperate regions: butterbur; sweet coltsfoot