Crossword clues for the word: USSS The word USSS has appeared as an answer to at least 6 crossword clues on different crossword puzzles. Crossword clues for USSS Showing 1 to 6 of 6 results Clue(s) American ship initials American vessel: Abbr. Initials on an American ship Letters on American vessels. Marine initials. Sea-going initials.