sweet gale vs Scotch gale

sweet gale and Scotch gale both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet gale	Yes	No	No	No
Scotch gale	Yes	No	No	No

As nouns, sweet gale and Scotch gale are synonyms defined as:

sweet gale and Scotch gale: bog shrub of north temperate zone having bitter-tasting fragrant leaves

Other synonyms of sweet gale include Myrica gale.

sweet gale (noun)	Scotch gale (noun)
bog shrub of north temperate zone having bitter-tasting fragrant leaves	bog shrub of north temperate zone having bitter-tasting fragrant leaves