Jobber: A wrestler whose purpose is to make their opponent look dominant, of course, making themselves look weak in the process, and then to ultimately lose the match.
Squasher: Generally the opponent of the jobber, the dominating force, used to pick up easy wins without barely breaking a sweat.
Face: The good guy. The hero. The wrestler that receives massive cheers and chants from the audience.
Heel: The bad guy. The villain. The wrestler who'll try to win by any means necessary, using dirty tactics.
Tweener: In other words, an (inbetweener), neither a face or heel. This wrestler can use heel tactics and still receive a crowd reaction like a face.
Turn: When a wrestler switches from face to heel or vice versa, heel to face.
Screwjob: An abrupt and controversial ending to a match, usually involving outside interference or cheating.
Kayfabe: Staged events that are to be portrayed as "true" or "real."
Heat: A negative reaction toward a wrestler.
Gimmick: A wrestler's persona.
Last but not least,
Push: Increase in popularity by positive exposure and gaining clean wins.