PROTOCOL /ˈpɹəʊtəˌkɒl/ Scrabble 12 Words With Friends 15 Definition noun (computer science) rules determining the format and transmission of data. — synonyms: communications_protocol noun forms of ceremony and etiquette observed by diplomats and heads of state. noun code of correct conduct. See all 54 words you can make from PROTOCOL → 8-letter words Words starting with P Words ending with L ← Unscramble different letters