acronym 2023-11-01 NASA is an word acronym for the US National Aeronautics and Space Administration because the acronym is pronounced. FBI is an initialism (also known as alphabetism) for the US Federal Bureau of Investigation since the letters are pronounced one at a time. JPEG is an acronym for Joint Photographic Experts Group but does not count as a word acronym nor an initialism since it is mixed how it is pronounced. A synonym type for describing abbreviations that are a part of the full name's words, such as initialisms or alphabetisms. synonym_type_property