Frequenter \Fre*quent*er\, n. One who frequents; one who often visits, or resorts to customarily. [1913 Webster]
20 Moby Thesaurus words for "frequenter": aficionado, attender, audience, buff, caller, company, denizen, fan, freeloader, gate-crasher, guest, habitue, haunter, moocher, patron, spectator, theatergoer, uninvited guest, visitant, visitor