petitioner — a formally drawn request, often bearing the names of a number of those making the request, that is addressed to a person or group of persons in authority or power, soliciting some favor, right, mercy, or other benefit: a petition for clemency; a petition for the repeal of an unfair law.
appellant — An appellant is someone who is appealing against a court's decision after they have been judged guilty of a crime.
complainant — A complainant is a person who starts a court case in a court of law.
prosecutor — Law. prosecuting attorney. a person, as a complainant or chief witness, instigating prosecution in a criminal proceeding.
informer — a person who informs against another, especially for money or other reward.
rat — any of several long-tailed rodents of the family Muridae, of the genus Rattus and related genera, distinguished from the mouse by being larger.
tattletale — a talebearer or informer, especially among children.
