To Inform

1. (archaic, transitive) To instruct, train (usually in matters of knowledge).
2. (transitive) To communicate knowledge to.
3. (intransitive) To impart information or knowledge.
4. To act as an informer; denounce.
5. (transitive) To give form or character to; to inspire (with a given quality); to affect, influence (with a pervading principle, idea etc.).
6. (obsolete, intransitive) To make known, wisely and/or knowledgeably.
7. (obsolete, transitive) To direct, guide.
8. (archaic, intransitive) To take form; to become visible or manifest; to appear.

(communicate knowledge to (trans.)): acquaint, apprise, notify

(act as informer): dob, name names, peach, snitch; rat out

(take form): materialize, take shape; come into being