wood aster vs aster

wood aster and aster both are nouns.

Word	Noun	Adjective	Verb	Adverb
wood aster	Yes	No	No	No
aster	Yes	No	No	No

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

wood aster: any of several asters of eastern North America usually growing in woods
aster: any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers

wood aster (noun)	aster (noun)
any of several asters of eastern North America usually growing in woods	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