Nouns

(n)act, enactmenta legal document codifying the result of deliberations of a committee or society or legislative body
(n)act, deed, human action, human activitysomething that people do or cause to happen
(n)acta subdivision of a play or opera or ballet
(n)act, routine, number, turn, bita short performance that is part of a longer program“he did his act three times every evening”, “she had a catchy little routine”, “it was one of the best numbers he ever did”
(n)acta manifestation of insincerity“he put on quite an act for her benefit”

Verbs

(v)act, moveperform an action, or work out or perform (an action)“think before you act”, “We must move quickly”, “The governor should act on the new energy bill”, “The nanny acted quickly by grabbing the toddler and covering him with a wet towel”
(v)act, behave, do, acquit, bear, deport, conduct, comport, carrybehave in a certain manner; show a certain behavior; conduct or comport oneself“You should act like an adult”, “Don't behave like a fool”, “What makes her do this way?”, “The dog acts ferocious, but he is really afraid of people”
(v)act, play, representplay a role or part“Gielgud played Hamlet”, “She wants to act Lady Macbeth, but she is too young for the role”, “She played the servant to her husband's master”
(v)actdischarge one's duties“She acts as the chair”, “In what capacity are you acting?”
(v)act, play, act aspretend to have certain qualities or state of mind“He acted the idiot”, “She plays deaf when the news are bad”
(v)actbe suitable for theatrical performance“This scene acts well”
(v)work, acthave an effect or outcome; often the one desired or expected“The voting process doesn't work as well as people thought”, “How does your idea work in practice?”, “This method doesn't work”, “The breaks of my new car act quickly”, “The medicine works only if you take it with a lot of water”
(v)dissemble, pretend, actbehave unnaturally or affectedly“She's just acting”
(v)act, play, roleplay, playactperform on a stage or theater“She acts in this play”, “He acted in ‘Julius Caesar’”, “I played in ‘A Christmas Carol’”