Magnolia acuminata vs magnolia

Magnolia acuminata and magnolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Magnolia acuminata	Yes	No	No	No
magnolia	Yes	No	No	No

As nouns, magnolia is a hypernym of Magnolia acuminata; that is, magnolia is a word with a broader meaning than Magnolia acuminata:

Magnolia acuminata: American deciduous magnolia having large leaves and fruit like a small cucumber
magnolia: any shrub or tree of the genus Magnolia; valued for their longevity and exquisite fragrant blooms

Magnolia acuminata (noun)	magnolia (noun)
American deciduous magnolia having large leaves and fruit like a small cucumber	any shrub or tree of the genus Magnolia; valued for their longevity and exquisite fragrant blooms
	dried bark of various magnolias; used in folk medicine