casino vs royal casino

casino and royal casino both are nouns.

Word	Noun	Adjective	Verb	Adverb
casino	Yes	No	No	No
royal casino	Yes	No	No	No

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

casino: a card game in which cards face up on the table are taken with eligible cards in the hand
royal casino: a form of casino in which face cards have extra point values

Other hyponyms of casino include spade casino.

casino (noun)	royal casino (noun)
a card game in which cards face up on the table are taken with eligible cards in the hand	a form of casino in which face cards have extra point values
a public building for gambling and entertainment