homonym

Definitions

(Noun) A word with the same spelling but with different meanings.
eg.
Fair - a place where people go to ride on amusements.
Fair - to be equal handed in a decision.

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(Noun) A word that shares both sound and spelling with another, but means something else.
For example: "Cleave" can mean either "cling" (a barnacle cleaves to a ship) or "split, usually into substantially-proportioned pieces" - "the butcher cleaved the side of beef with one mighty whack," "the iceberg-to-be cleaved from the glacier."

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(Noun) word that sound the same as another but has a different meaning

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means the same as