kalmia vs shrub

kalmia and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
kalmia	Yes	No	No	No
shrub	Yes	No	No	No

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

Other hypernyms of kalmia include bush.

kalmia (noun)	shrub (noun)
any plant of the genus Kalmia	a low woody perennial plant usually having several major stems