lojbab, your reply was enlightening. Thanks for taking the time to reply.
The only thing I do not get is the gait argument on bajra. I don't see how that can be filled other then with attributive words like masno (slow) or sutra (fast). If you put a word that means "gallop" or "trot" than why would you need bajra -- you already have a word for gallop or trot.