rock-and-roll vs rock and roll

rock-and-roll and rock and roll both are nouns.

Word	Noun	Adjective	Verb	Adverb
rock-and-roll	Yes	No	No	No
rock and roll	Yes	No	No	No

As nouns, rock-and-roll and rock and roll are synonyms defined as:

rock-and-roll and rock and roll: a genre of popular music originating in the 1950s; a blend of black rhythm-and-blues with white country-and-western

Other synonyms of rock-and-roll include rock'n'roll, rock 'n' roll, rock, rock music.

rock-and-roll (noun)	rock and roll (noun)
a genre of popular music originating in the 1950s; a blend of black rhythm-and-blues with white country-and-western	a genre of popular music originating in the 1950s; a blend of black rhythm-and-blues with white country-and-western