Crossword clues for the word: LIGHTYEARS The word LIGHTYEARS has appeared as an answer to at least 3 crossword clues on different crossword puzzles. Crossword clues for LIGHTYEARS Showing 1 to 3 of 3 results Clue(s) Considerable distance Large distance? Largish yet possibly achievable! Units of about 5.88 trillion miles: Hyph.