RichThesaurus
arse-kisser
vs
ass-kisser
arse-kisser
noun
A sycophant.
ass-kisser
noun
Someone who kisses ass (who acts obsequiously in order to gain another's favor).
How often have the words
arse-kisser
and
ass-kisser
occurred in a corpus of books?
(source:
Google Ngram Viewer
)