An acronym is a word formed from the initial letters of other words. Acronyms, unlike initialisms, are pronounced as a single word. For example, "NASA" is an **acronym**, "FBI" is an **initialism**. Abbreviations (such as *Rd." for "Road") are pronounced the same as the word that they are abbreviating.

An acronym is a word formed from the initial letters of other words. Acronyms, unlike initialisms, are pronounced as a single word. For example, NASA is an acronym, FBI is an initialism. Abbreviations (such as Rd. for "Road") are pronounced the same as the word that they are abbreviating.