rock and roll vs rock'n'roll

rock and roll and rock'n'roll both are nouns.

Word	Noun	Adjective	Verb	Adverb
rock and roll	Yes	No	No	No
rock'n'roll	Yes	No	No	No

As nouns, rock and roll and rock'n'roll are synonyms defined as:

rock and roll and rock'n'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-and-roll, rock 'n' roll, rock, rock music.

rock and roll (noun)	rock'n'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