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he was better versed in his profession than his compeers
A companion or associate
Web Definitions:
peer: a person who is of equal standing with another in a group
Compeer, Inc., is an international, non-profit organization that seeks to help people overcome the effects of mental illness through the power of friendship. The founding Compeer program was established in Rochester, New York in 1973 by Bernice W. Skirboll. ...
the equal or peer of someone else; someone who is a close companion or associate of someone else
A program that matches a volunteer with a person with mental illness.