Apparently it is an ..... where the letters in the word are the first letters of a group of words. (*) abbreviation (*) addition (*) anomaly (*) acronym
This is a companion discussion topic for the original entry at https://english.best/questions/3915,apparently-it-is-an-___-where-the-letters-in-the-word-are-the-first-letters-of-a-group-of-words/