Crossword clues for the word: LIGHTYEAR The word LIGHTYEAR has appeared as an answer to at least 12 crossword clues on different crossword puzzles. Crossword clues for LIGHTYEAR Showing 1 to 12 of 12 results Clue(s) 52 weeks of easy work? About 5.88 trillion miles About six trillion miles Astronomer's unit. Astronomical unit of distance Easy two semesters at school? It's a distance measure Long distance? Insubstantial and not entirely long Nearly 6 trillion miles Slow period for business Unit of distance (not time) Unit of distance in astronomy