Synonyms for Spotter:

n.

follower, aficionado, evangelist, man, lover, devotee, supporter, fan, fanatic, enthusiast. pro, coach, personal trainer, cross-training, spot, coaching, professional, train. detector (noun)
discoverer.
lookout (noun)
sentry, scout, watch, sentinel.
picket (noun)
lookout.
scout (noun)
picket.
spotter (noun)
sentinel, lookout, watch, picket, discoverer, lookout man, finder, sentry, scout.

Other synonyms:

cross-training, coaching, personal trainer. pro. coach. professional. train. spot. Other relevant words:
train, scout, cross-training, spot.

Usage examples for spotter

  1. They think," he added shrewdly, " 't you're a spotter or something. – Cow-Country by B. M. Bower