What is the grammatical term for words like NASA, RADAR, SCUBA, SNAFU, NIMBY, etc.?
I know that they are abbreviations of the first word of each letter. SCUBA = Self-Contained Underwater Breathing Apparatus. But I thought that there is another grammatical term for these words. And, just now, I forgot what the term for words like RADAR and racecar, bob, bib, mom, tot, etc (words that are spelled the same way forwards or backwards).