Eastern silvery aster vs aster

Eastern silvery aster and aster both are nouns.

Word	Noun	Adjective	Verb	Adverb
Eastern silvery aster	Yes	No	No	No
aster	Yes	No	No	No

As nouns, aster is a hypernym of Eastern silvery aster; that is, aster is a word with a broader meaning than Eastern silvery aster:

Eastern silvery aster: a variety of aster (Symphyotrichum concolor L.)
aster: any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers

Eastern silvery aster (noun)	aster (noun)
a variety of aster (Symphyotrichum concolor L.)	star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis
	any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers