genus Pyrethrum vs family Compositae

genus Pyrethrum and family Compositae both are nouns.

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

genus Pyrethrum (noun)	family Compositae (noun)
used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum	plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia