The word "guiler" is spelled with a "g", "u", "i", "l", "e", and "r". In IPA phonetic transcription, it would be /ˈɡaɪ.lər/. The "g" is pronounced as a voiced velar stop, the "ai" is pronounced as the diphthong /aɪ/, the "l" as an alveolar lateral approximant, the "e" as a schwa /ə/, and the "r" as an alveolar approximant or a retroflex approximant depending on the speaker's accent.
A deceiver.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.