We don't have synonyms for kiss arse yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are kiss ass, kissed arse and kisses arse.
(v) :
(UK, Ireland, idiomatic, sometimes vulgar, colloquial) Alternative form of kiss ass, to curry favour with the powerful by obsequious flattery. [(US, idiomatic, sometimes vulgar, colloquial) to flatter or perform favors excessively, especially to receive preferential treatment from a boss or other superior; to behave obsequiously.]
(v) :
(UK, Ireland, idiomatic, sometimes vulgar, colloquial) Alternative form of kiss ass, to curry favour with the powerful by obsequious flattery. [(US, idiomatic, sometimes vulgar, colloquial) to flatter or perform favors excessively, especially to receive preferential treatment from a boss or other superior; to behave obsequiously.]