rock-and-roll vs rock music

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

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

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

rock-and-roll and rock music: 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 and roll.

rock-and-roll (noun)	rock music (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