swamp laurel vs swamp bay

swamp laurel and swamp bay both are nouns.

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

As nouns, swamp laurel and swamp bay are synonyms defined as:

swamp laurel and swamp bay: shrub or small tree having rather small fragrant white flowers; abundant in southeastern United States

Other synonyms of swamp laurel include Magnolia virginiana, sweet bay.

swamp laurel (noun)	swamp bay (noun)
laurel of bogs of northwestern United States having small purple flowers and pale leaves that are glaucous beneath	shrub or small tree having rather small fragrant white flowers; abundant in southeastern United States
shrub or small tree having rather small fragrant white flowers; abundant in southeastern United States