mountain laurel vs Kalmia latifolia

mountain laurel and Kalmia latifolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain laurel	Yes	No	No	No
Kalmia latifolia	Yes	No	No	No

As nouns, mountain laurel and Kalmia latifolia are synonyms defined as:

mountain laurel and Kalmia latifolia: a North American evergreen shrub having glossy leaves and white or rose-colored flowers

Other synonyms of mountain laurel include American laurel, calico bush, wood laurel.

mountain laurel (noun)	Kalmia latifolia (noun)
a North American evergreen shrub having glossy leaves and white or rose-colored flowers	a North American evergreen shrub having glossy leaves and white or rose-colored flowers
Pacific coast tree having aromatic foliage and small umbellate flowers followed by olivelike fruit; yields a hard tough wood