An abbreviation formed by the beginning letters or syllables of other words (as "Benelux").
An abbreviation formed by the initial letters of other words, sometimes exclusively such abbreviations when pronounced as a word (as "laser") rather than as individual letters (initialisms such as "TNT").
To form into an acronym.
A word with the same meaning as another formed by removing one or more of the syllables of the longer word, and considered a word in its own right rather than an abbreviation.
Particularly in Slavic languages, a shortened form of the adjective, used predicatively.