Pinch-runners are common in baseball when a faster, more strategic runner is needed on base. However, there are a few synonyms that can be used instead of "pinch-runner" such as "speedster", "base stealer", "runner", or "substitute runner". These words all indicate the same idea - a player who is brought in to run in place of another player, typically for the purpose of advancing a runner or scoring a run. These synonyms add variety to a writer's vocabulary and can help to avoid repetition and monotony in writing.