accuser
I
noun
accusant, accusatrix, challenger, complainant, delator, denouncer, impeacher, incriminator, indictor, informer, libelant, litigant, party to a suit, petitioner, prosecutor
II
index
claimant, complainant, district attorney, informant, informer (one providing criminal information), plaintiff
Burton's Legal Thesaurus.
William C. Burton.
2006