Shill and Stalking-horse

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

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

Stalking-horse noun - Something serving to conceal plans; a fictitious reason that is concocted in order to conceal the real reason.

Shill and stalking-horse are semantically related. You can use "Shill" instead a noun phrase "Stalking-horse".