/ Thesaurus / B Synonyms of base runner Find synonyms for: Noun1. base runner, runner, ballplayer, baseball playerusage: a baseball player on the team at bat who is on base (or attempting to reach a base)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language