sales outlet vs mercantile establishment

sales outlet and mercantile establishment both are nouns.

Word	Noun	Adjective	Verb	Adverb
sales outlet	Yes	No	No	No
mercantile establishment	Yes	No	No	No

As nouns, sales outlet and mercantile establishment are synonyms defined as:

sales outlet and mercantile establishment: a place of business for retailing goods

Other synonyms of sales outlet include outlet, retail store.

sales outlet (noun)	mercantile establishment (noun)
a place of business for retailing goods	a place of business for retailing goods