Cassiope mertensiana vs heath

Cassiope mertensiana and heath both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cassiope mertensiana	Yes	No	No	No
heath	Yes	No	No	No

As nouns, heath is a hypernym of Cassiope mertensiana; that is, heath is a word with a broader meaning than Cassiope mertensiana:

Cassiope mertensiana: heath of mountains of western United States having bell-shaped white flowers
heath: a low evergreen shrub of the family Ericaceae; has small bell-shaped pink or purple flowers

Cassiope mertensiana (noun)	heath (noun)
heath of mountains of western United States having bell-shaped white flowers	a tract of level wasteland; uncultivated land with sandy soil and scrubby vegetation
	a low evergreen shrub of the family Ericaceae; has small bell-shaped pink or purple flowers