actor

noun

1. One that acts doer
2. One who acts in a play, movie, television show, etc.
3. One who behaves as if acting a part
4. One that takes part in any affair participant

   "political actors"

noun

1. A person, group, country, etc. who purposely and usually repeatedly engages in very bad behavior (such as committing crimes or causing harm to others)

   "Giving users a way to prove that they're being harassed with, say, a screenshot or some other form of authentication could help Twitter catch bad actors, even after they've covered their tracks."

noun

1. An actor who is known for playing many different and unusual characters

noun

1. One who acts with another a fellow actor

   "… it's a worthy script with a number of worthy coactors."