finisher

(noun) (baseball) a relief pitcher who can protect a lead in the last inning or two of the game. Synonyms: closer.

(noun) a racing driver who finishes a race.

(noun) a painter who applies a finishing coat.

(noun) a worker who performs the last step in a manufacturing process.

(noun) a race car that finishes a race.

(noun) an animal that wins in a contest of speed.