market vs money market

market and money market both are nouns.

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

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

Other hyponyms of market include bear market, bull market, the City, the Street, Wall Street.

market (noun)	money market (noun)
the world of commercial activity where goods and services are bought and sold	a market for short-term debt instruments
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

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