rocker vs instrumentalist

rocker and instrumentalist both are nouns.

Word	Noun	Adjective	Verb	Adverb
rocker	Yes	No	No	No
instrumentalist	Yes	No	No	No

As nouns, instrumentalist is a hypernym of rocker; that is, instrumentalist is a word with a broader meaning than rocker:

Other hypernyms of rocker include musician, player.

rocker (noun)	instrumentalist (noun)
a curved support that permits the supported object to rock to and fro	someone who plays a music as a profession
a chair mounted on rockers
an ice skate with a curved blade
a trough that can be rocked back and forth; used by gold miners to shake auriferous earth in water in order to separate the gold
a teenager or young adult in the 1960s who wore leather jackets and rode motorcycles
a performer or composer or fan of rock music
an attendant who rocks a child in a cradle