Synonyms for Walk-on:

n.

actress, character actor, actor, body double, lead, COSTAR, double, heart-throb, ham, leading lady. bad guy, bit part, alias, goodie, credit, good guy, cameo, baddy, chorus, extra. head, move, progress, carry on, press, go, flow, forge ahead, pass. actor (noun)
extra, lead, ham.
minor role (noun)
bit part.
part (noun)
bit part, cameo.
player (noun)
actor.
walk-on (noun)
mute, tongueless, nonspeaking.

Other synonyms:

forge ahead. carry on. flow, progress. press. head. move. go. pass. Other relevant words:
bit part, extra, leading lady, actor.