Maecenas, abettor, admirer, advocate, amateur, angel, apologist, attender, audience, authority, backer, buff, bug, champion, connoisseur, crank, critic, defender, dependence, devotee, dilettante, encourager, endorser, energumen, enthusiast, expert, exponent, fan, fanatic, fanatico, favorer, freak, frequenter, friend at court, habitue, haunter, infatuate, lover, lunatic fringe, mainstay, maintainer, monomaniac, nut, paranymph, partisan, patron, promoter, protagonist, pundit, reliance, savant, scholar, second, seconder, sectary, sider, specialist, spectator, sponsor, stalwart, standby, support, supporter, sustainer, sympathizer, technical expert, technician, theatergoer, upholder, visitor, votary, well-wisher, zealot