aster family vs genus Dahlia

aster family and genus Dahlia both are nouns.

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

aster family (noun)	genus Dahlia (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	genus of perennial tuberous plants of Mexico and Central America