IPA: /ˈpɒlɪfəʊn/
KK: /ˈpɒlɪfoʊn/
A character or group of characters that can represent more than one sound in a language, like certain letters in English that can be pronounced in different ways.
The letter 'a' is a polyphone because it can sound different in words like 'cat' and 'cake'.
Polyphone → It is formed from "poly-" (from Greek "polus", meaning many) and "phone" (from Greek "phone", meaning voice or sound). The word "polyphone" refers to a device or system that can produce many sounds or voices.
Think of 'many' ('poly-') voices or sounds ('phone') coming together — that's what polyphone means.
No commonly confused words.