Compositae vs genus Tanacetum

Compositae and genus Tanacetum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Compositae	Yes	No	No	No
genus Tanacetum	Yes	No	No	No

Compositae (noun)	genus Tanacetum (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	a large genus of plants resembling chrysanthemums; comprises some plants often included in other genera especially genus Chrysanthemum