family Compositae vs genus Iva

family Compositae and genus Iva both are nouns.

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

family Compositae (noun)	genus Iva (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	small genus of American herbs or shrubs; in some classifications placed in a separate family Ambrosiaceae