Synonyms for Pacer:

n.

mount, pony, animal, steed, horse. example, criterion, standard, measure. animal (noun)
pacemaker, pacesetter.
pacer (noun)
pacemaker, pacesetter.
pacesetter (noun)
pacesetter.

Other synonyms:

horse. Other relevant words:
pony, animal, criterion, measure, mount, example, horse, standard, steed.