market vs greengrocery

market and greengrocery both are nouns.

Word	Noun	Adjective	Verb	Adverb
market	Yes	No	Yes	No
greengrocery	Yes	No	No	No

As nouns, greengrocery is a hyponym of market; that is, greengrocery is a word with a more specific, narrower meaning than market:

Other hyponyms of market include supermarket.

market (noun)	greengrocery (noun)
the world of commercial activity where goods and services are bought and sold	a greengrocer's grocery store
a marketplace where groceries are sold	groceries sold by a greengrocer
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

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