late purple aster vs aster

late purple aster and aster both are nouns.

Word	Noun	Adjective	Verb	Adverb
late purple aster	Yes	No	No	No
aster	Yes	No	No	No

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

late purple aster: a variety of aster (Symphyotrichum patens)
aster: any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers

late purple aster (noun)	aster (noun)
a variety of aster (Symphyotrichum patens)	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