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Difference between Abbreviation, Acronym and Initialism

An abbreviation is a shortened word form of a word or phrase that cannot be pronounced as another word (Dept., Prof. Mgr., etc.).

An acronym is a group of initials that can be pronounced as a word (radar, scuba, sonar, etc).

An initialism is a group of initials that cannot be pronounced as a word (FBI, HTML, IRA, etc.).