swamp laurel vs kalmia

swamp laurel and kalmia both are nouns.

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

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

swamp laurel: laurel of bogs of northwestern United States having small purple flowers and pale leaves that are glaucous beneath
kalmia: any plant of the genus Kalmia

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