The crossword clue "competitor" can have several answers depending on the number of letters needed. Common answers include:

• RIVAL (5 letters)
• RACER (5 letters)
• CONTENDER (9 letters)
• ENTRANT (7 letters)
• PLAYER (6 letters)
• FOE (3 letters)
• PARTICIPANT (11 letters)

These words all represent the idea of someone who competes or participates in a contest.