Synonyms for Bassist:

n.

busker, bandsman, drum major, concertmaster, accompanist. musician (noun)
harpsichordist, flutist, composer, oboist, trumpeter, baritone, harpist, saxophonist, virtuoso, performer, clarinetist, guitarist, singer, bass, Accordionist, bassoonist, pianist, tenor, player, violinist, soprano, maestro, trombonist, keyboardist, alto, musician, cellist, banjoist, fiddler, arranger, instrumentalist, drummer.

Other synonyms:

busker, bandsman, drum major, concertmaster, accompanist. Other relevant words:
bandsman, busker, concertmaster, accompanist.