Main spellings (~99%)
⟨oi⟩ ~57%
The most common spelling for this sound. Usually found in the middle of words.
⟨oy⟩ ~42%
Almost as common as ⟨oi⟩. Found at the end of words.
Use ⟨oi⟩ in the middle of words, ⟨oy⟩ at the end. This pattern is almost always reliable.