swamp bay vs magnolia

swamp bay and magnolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
swamp bay	Yes	No	No	No
magnolia	Yes	No	No	No

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

swamp bay: shrub or small tree having rather small fragrant white flowers; abundant in southeastern United States
magnolia: any shrub or tree of the genus Magnolia; valued for their longevity and exquisite fragrant blooms

swamp bay (noun)	magnolia (noun)
shrub or small tree having rather small fragrant white flowers; abundant in southeastern United States	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