retail market vs marketplace

retail market and marketplace both are nouns.

Word	Noun	Adjective	Verb	Adverb
retail market	Yes	No	No	No
marketplace	Yes	No	No	No

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

retail market: the market for the sale of goods or services to consumers rather than producers or intermediaries.
marketplace: the world of commercial activity where goods and services are bought and sold

Other hypernyms of retail market include market, market place.

retail market (noun)	marketplace (noun)
the market for the sale of goods or services to consumers rather than producers or intermediaries.	the world of commercial activity where goods and services are bought and sold
	an area in a town where a public mercantile establishment is set up