informant

informant is a   Noun

Definition:

[1] One who, or that which, informs, animates, or vivifies. [Obs.] Glanvill.

[2] One who imparts information or instruction.

[3] One who offers an accusation; an informer. See Informer. [Obs. or R.] It was the last evidence of the kind; the informant was hanged. Burke.

Synonyms: