marketplace vs sales outlet

marketplace and sales outlet both are nouns.

Word	Noun	Adjective	Verb	Adverb
marketplace	Yes	No	No	No
sales outlet	Yes	No	No	No

As nouns, sales outlet is a hypernym of marketplace; that is, sales outlet is a word with a broader meaning than marketplace:

marketplace: an area in a town where a public mercantile establishment is set up
sales outlet: a place of business for retailing goods

Other hypernyms of marketplace include mercantile establishment, outlet, retail store.

marketplace (noun)	sales outlet (noun)
the world of commercial activity where goods and services are bought and sold	a place of business for retailing goods
an area in a town where a public mercantile establishment is set up