Orderer: who asks for something with anger and abruptness.
A person who makes a request or request to an office or office. It is usually done in writing and must be answered in the same way. Applicant.
Petitioner (ria), is the person who makes or files a petition with an authority or before a public or private entity. The request can be verbal or written.
petitioner: Jesus said be a demand or a legal, official or public request that someone requests.