"groveller" in the noun sense
1. apple polisher, bootlicker, fawner, groveller, groveler, truckler
someone who humbles himself as a sign of respect who behaves as if he had no self-respect
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License