family Compositae vs genus Tithonia

family Compositae and genus Tithonia both are nouns.

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

family Compositae (noun)	genus Tithonia (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	genus of robust herbs of Mexico and Central America: Mexican sunflower