Aster falcatus vs aster

Aster falcatus and aster both are nouns.

Word	Noun	Adjective	Verb	Adverb
Aster falcatus	Yes	No	No	No
aster	Yes	No	No	No

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

Aster falcatus: perennial of western North America having white flowers
aster: any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers

Aster falcatus (noun)	aster (noun)
perennial of western North America having 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