open-air market vs market

open-air market and market both are nouns.

Word	Noun	Adjective	Verb	Adverb
open-air market	Yes	No	No	No
market	Yes	No	Yes	No

As nouns, market is a hypernym of open-air market; that is, market is a word with a broader meaning than open-air market:

Other hypernyms of open-air market include market place, marketplace, mart.

open-air market (noun)	market (noun)
a public marketplace where food and merchandise is sold	the world of commercial activity where goods and services are bought and sold
	a marketplace where groceries are sold
	an area in a town where a public mercantile establishment is set up
	the customers for a particular product or service
	the securities markets in the aggregate

open-air market (verb)	market (verb)
	make commercial
	engage in the commercial promotion, sale, or distribution of
	deal in a market
	buy household supplies