The word "STOY" is spelled with four letters and two syllables. The first syllable is pronounced as [st], which is a voiceless alveolar stop. The second syllable is pronounced as [ɔɪ], which is a diphthong composed of the vowel [ɔ] and the glide [ɪ]. This diphthong is commonly represented in English by the letters "oy" or "oi". Overall, the spelling of "STOY" accurately represents its pronunciation in English.