THESAURUS
petitioner
accusant, accuser, adorer, allegator, appellant, applicant, asker, aspirant, beadsman, beggar, bidder, candidate, celebrant, chapelgoer, churchgoer, claimant, communicant, complainant, congregation, daily communicant, delator, evangelist, idolater, impeacher, impugner, indictor, informer, libelant, party, plaintiff, postulant, prayer, prosecutor, revivalist, seeker, solicitant, solicitor, suitor, suppliant, supplicant, supplicator, the prosecution, venerator, votary, worshiper
ROGET THESAURUS
petitioner
Petitioner
N
petitioner, solicitor, applicant, suppliant, supplicant, suitor, candidate, claimant, postulant, aspirant, competitor, bidder, place hunter, pot hunter, prizer, seeker, beggar, mendicant, moocher, panhandler, freeloader, sponger, mumper, sturdy beggar, cadger, hotel runner, runner, steerer, tout, touter, pauper, homeless person, hobo, bum, tramp, bindle stiff, bo, knight of the road (poverty), hippie, flower child, hard core unemployed, welfare client, welfare case, canvasser, bagman, salesman.