market square vs souk

market square and souk both are nouns.

Word	Noun	Adjective	Verb	Adverb
market square	Yes	No	No	No
souk	Yes	No	No	No

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

Other hyponyms of market square include farmer's market, green market, greenmarket, flea market.

market square (noun)	souk (noun)
a public marketplace where food and merchandise is sold	an open-air market in an Arabian city