Informant

n.	1.	One who, or that which, informs, animates, or vivifies.
	2.	One who imparts information or instruction.
	3.	One who offers an accusation; an informer. See Informer. It was the last evidence of the kind; the informant was hanged. - Burke.

Noun	1.	informant - a person who supplies information Synonyms: source
	2.	informant - someone who sees an event and reports what happened Synonyms: witness, witnesser

adviser, announcer, annunciator, attestant, attestator, attester, authority, bystander, channel, cojuror, communicant, communicator, compurgator, deponent, earwitness, enlightener, examinant, examinate, examinee, expert witness, eyewitness, gossipmonger, grapevine, information center, information medium, informer, interviewee, monitor, mouthpiece, newsmonger, notifier, passerby, press, public relations officer, publisher, questionee, quizzee, radio, reporter, source, spectator, spokesman, subject, swearer, television, teller, testifier, tipster, tout, voucher, witness