It is someone who acts an performs.
I currently don't have a definition for "thesbian." It may be a typo or a less common variation of the word "Thespian," which refers to a person involved in theater or acting.
The noun 'actor' and the noun 'actress' are both common nouns, general word for someone who play roles in plays, movies, commercials, etc.; a word for any actor or actress of any kind.