Acronym
Part of speech: noun
Definition: An abbreviation formed by (usually initial) letters taken from a word or series of words, and which is itself pronounced as a word, such as RAM, radar, or scuba; sometimes contrasted with initialism. A pronounceable word formed from the beginnings (letter or syllable) of other words and thus representing the phrase so formed, e.g. Benelux = the countries Belgium, Netherlands and Luxembourg considered as a political or economic whole. Any abbreviation so formed, regardless of pronunciation, such as TNT, IBM, or XML.
Synonym
Part of speech: noun
Definition: A word or phrase with a meaning that is the same as, or very similar to, another word or phrase.Any of the formal names for the taxon, including the valid name (i.e. the senior synonym).Any name for the taxon, usually a validly published, formally accepted one, but often also an unpublished name.