Words different in meaning but similar in sound

One word substitute is Homonym.

Homonym: each of two or more words having the same spelling or pronunciation but different meanings and origins.
Synonym: a word or phrase that means exactly or nearly the same as another word or phrase in the same language, for example shut is a synonym of close.
Acronym: an abbreviation formed from the initial letters of other words and pronounced as a word.
Antonym: a word opposite in meaning to another (e.g. bad and good ).