There are four phonemes in the word plan.
The smallest meaningful unit of sound in a language is called a phoneme. Any sound that transforms one word into another is meaningful. For instance, although the words cat and fat are different, only one sound distinguishes the two words: the first sound.
In speech, a phoneme is a sound. The smallest unit of sound that separates one word from another is called a phoneme. We utilize letters to signify or stand for sounds since they cannot be written. A grapheme is a letter or group of characters that represents a single sound in writing.
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