Nouns

(n)closer, finisher(baseball) a relief pitcher who can protect a lead in the last inning or two of the game
(n)finishera racing driver who finishes a race
(n)finishera painter who applies a finishing coat
(n)finishera worker who performs the last step in a manufacturing process
(n)finishera race car that finishes a race
(n)finisheran animal that wins in a contest of speed