Aster shortii vs aster

Aster shortii and aster both are nouns.

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

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

Aster shortii: perennial of southeastern United States having usually blue flowers
aster: any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers

Aster shortii (noun)	aster (noun)
perennial of southeastern United States having usually blue 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