genus Tanacetum vs Compositae

genus Tanacetum and Compositae both are nouns.

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

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