(n.) One who flatters.

adulator apple-polisher ass-licker backscratcher backslapper blarneyer bootlick bootlicker brown-nose brownie cajoler clawback courtier creature cringer dupe fawner flunky footlicker groveler handshaker hanger-on helot instrument jackal kowtower lackey led captain leech lickspit lickspittle mealymouth minion parasite peon puppet serf slave spaniel sponge stooge suck sycophant timeserver toad toady tool truckler tufthunter wheedler yes-man