upland white aster vs aster

upland white aster and aster both are nouns.

Word	Noun	Adjective	Verb	Adverb
upland white aster	Yes	No	No	No
aster	Yes	No	No	No

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

upland white aster: tufted rigid North American perennial with loose clusters of white flowers
aster: any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers

upland white aster (noun)	aster (noun)
tufted rigid North American perennial with loose clusters of white flowers	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