market place vs sales outlet

market place and sales outlet both are nouns.

Word	Noun	Adjective	Verb	Adverb
market place	Yes	No	No	No
sales outlet	Yes	No	No	No

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

market place: 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 market place include mercantile establishment, outlet, retail store.

market place (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