family Compositae vs genus Xeranthemum

family Compositae and genus Xeranthemum both are nouns.

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

family Compositae (noun)	genus Xeranthemum (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	genus of annual densely hairy herbs of Mediterranean to southwestern Asia