family Asteraceae vs genus Dahlia

family Asteraceae and genus Dahlia both are nouns.

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

family Asteraceae (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