rough-leaved aster vs aster

rough-leaved aster and aster both are nouns.

Word	Noun	Adjective	Verb	Adverb
rough-leaved aster	Yes	No	No	No
aster	Yes	No	No	No

As nouns, aster is a hypernym of rough-leaved aster; that is, aster is a word with a broader meaning than rough-leaved aster:

rough-leaved aster: a variety of aster (Eurybia radulina)
aster: any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers

rough-leaved aster (noun)	aster (noun)
a variety of aster (Eurybia radulina)	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