aster family vs genus Xanthium

aster family and genus Xanthium both are nouns.

Word	Noun	Adjective	Verb	Adverb
aster family	Yes	No	No	No
genus Xanthium	Yes	No	No	No

aster family (noun)	genus Xanthium (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	coarse herbs having small heads of greenish flowers followed by burrs with hooked bristles