market vs black market

market and black market both are nouns.

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

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

market: the world of commercial activity where goods and services are bought and sold
black market: an illegal market in which goods or currencies are bought and sold in violation of rationing or controls

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

market (noun)	black market (noun)
the world of commercial activity where goods and services are bought and sold	an illegal market in which goods or currencies are bought and sold in violation of rationing or controls
a marketplace where groceries are sold	people who engage in illicit trade
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)	black market (verb)
make commercial	deal in illegally, such as arms or liquor
engage in the commercial promotion, sale, or distribution of
deal in a market
buy household supplies