Shill and Whistle blower

Shill noun - A decoy who acts as an enthusiastic customer in order to stimulate the participation of others.

Whistle blower and shill are semantically related In some cases you can replace phrase "Whistle blower" with "Shill", this terms are similar.

Whistle blower noun - An informant who exposes wrongdoing within an organization in the hope of stopping it.

Shill and whistle blower are semantically related in informer to police topic. Sometimes you can use "Shill" instead a noun phrase "Whistle blower".