gambling hell vs casino

gambling hell and casino both are nouns.

Word	Noun	Adjective	Verb	Adverb
gambling hell	Yes	No	No	No
casino	Yes	No	No	No

As nouns, casino is a hyponym of gambling hell; that is, casino is a word with a more specific, narrower meaning than gambling hell:

gambling hell: a public building in which a variety of games of chance can be played (operated as a business)
casino: a public building for gambling and entertainment

Other hyponyms of gambling hell include gambling casino.

gambling hell (noun)	casino (noun)
a public building in which a variety of games of chance can be played (operated as a business)	a card game in which cards face up on the table are taken with eligible cards in the hand
	a public building for gambling and entertainment