The Oxford Thesaurus An A-Z Dictionary of Synonyms - annoyance n.

1) irritation, bother, vexation, exasperation, pique, aggravation, Colloq botheration: Must I put up with the annoyance of that constant bickering? 2 nuisance, pest, irritant, bore, Colloq pain, pain in the neck or arse or US ass: He's such an annoyance, I wish he'd leave.