swamp laurel vs bog kalmia

swamp laurel and bog kalmia both are nouns.

Word	Noun	Adjective	Verb	Adverb
swamp laurel	Yes	No	No	No
bog kalmia	Yes	No	No	No

As nouns, swamp laurel and bog kalmia are synonyms defined as:

swamp laurel and bog kalmia: laurel of bogs of northwestern United States having small purple flowers and pale leaves that are glaucous beneath

Other synonyms of swamp laurel include bog laurel, Kalmia polifolia.

swamp laurel (noun)	bog kalmia (noun)
laurel of bogs of northwestern United States having small purple flowers and pale leaves that are glaucous beneath	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