souk vs open-air marketplace

souk and open-air marketplace both are nouns.

Word	Noun	Adjective	Verb	Adverb
souk	Yes	No	No	No
open-air marketplace	Yes	No	No	No

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

souk: an open-air market in an Arabian city
open-air marketplace: a public marketplace where food and merchandise is sold

Other hypernyms of souk include market square, open-air market.

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