Synonyms for Acting:

adj.

acting (adjective)
alternate, operating, performing, deputy, working, temporary, practicing, pro tem, functioning, surrogate.
substitute (adjective)
substitute.
substituting in a role (adjective)
assistant, temporary, deputy, Delegated, surrogate, pro tem, ad interim, interim, alternate, provisional, adjutant.

n.

budding, auxiliary, casual, designate, creative, emeritus, blue-collar. go up, dark, method acting, opposite, dramatic, in, rep, on. dramatics, performing arts, stage, substitute, action. act, masquerade, pretense, disguise, Dissemblance, true, sham, show, honest, simulation. continue, provisional, ad interim, interim. act (noun)
playacting, performing, playing.
acting (noun)
performing, temporary, playacting, playing, impermanent.
entertaining, performing (noun)
playing, Dramatizing, dramatics, pretense.

v.

acting (verb)
moving, exercising, appearing, officiating, Endeavoring, Transacting, Doing, reacting, Perpetrating, Behaving, conducting, laboring, Comporting, executing.
behaving (verb)
proceeding, Deporting.
causing (verb)
driving, Eliciting, causing, engineering, Evoking, Originating, bringing about, Engendering, provoking, giving rise to, inducing, Generating, Enforcing, motivating, Producing, Effecting, making, inspiring, Forcing.
dramatizing (verb)
Presenting, pantomiming, miming, Characterizing, Dramatizing, playing, Improvising, choreographing, Burlesquing.
endeavoring (verb)
Aiming, Volunteering, Venturing, Committing, engaging, Attempting, undertaking, approaching, Assaying, contracting, Maneuvering, exploiting.
venturing (verb)
pursuing, Initiating, campaigning, scheming.
working (verb)
toiling.

Other synonyms:

designate, blue-collar, method acting, opposite, creative, dramatics, Dissemblance, emeritus. dark, simulation, auxiliary, dramatic. interim, rep, masquerade, provisional, casual. go up, disguise, pretense. on, in, stage. sham. act. temporary
ad interim.
Other relevant words:
designate, ad interim, honest, Delegated, disguise, substituting, opposite, pretense, blue-collar, budding, Dissemblance, true, dramatic, dramatics, impermanent, casual, on, interim, sham, masquerade, continue, show, emeritus, provisional, creative, auxiliary, adjutant, assistant, substitute, in, action, rep, stage, simulation, dark, act, playacting.

Usage examples for acting

  1. I do not wish that the day after to- morrow you should lay any charge upon me; for you are not doing anything for me, but you are acting for your own good. – Four Arthurian Romances "Erec et Enide", "Cliges", "Yvain", and "Lancelot" by Chretien DeTroyes
  2. He's been acting inspector for quite a while. – The Boy With the U. S. Life-Savers by Francis Rolt-Wheeler
  3. These acting people, they're not real folks. – The Branding Iron by Katharine Newlin Burt