purple heather vs Brewer's mountain heather

purple heather and Brewer's mountain heather both are nouns.

Word	Noun	Adjective	Verb	Adverb
purple heather	Yes	No	No	No
Brewer's mountain heather	Yes	No	No	No

As nouns, purple heather and Brewer's mountain heather are synonyms defined as:

purple heather and Brewer's mountain heather: semi-prostrate evergreen herb of western United States

Other synonyms of purple heather include Phyllodoce breweri.

purple heather (noun)	Brewer's mountain heather (noun)
semi-prostrate evergreen herb of western United States	semi-prostrate evergreen herb of western United States