retail store vs outlet

retail store and outlet both are nouns.

Word	Noun	Adjective	Verb	Adverb
retail store	Yes	No	No	No
outlet	Yes	No	No	No

As nouns, retail store and outlet are synonyms defined as:

Other synonyms of retail store include mercantile establishment, sales outlet.

retail store (noun)	outlet (noun)
a place of business for retailing goods	activity that frees or expresses creative energy or emotion
	an opening that permits escape or release
	a place of business for retailing goods
	receptacle providing a place in a wiring system where current can be taken to run electrical devices