Crossword clues for the word: LIGHTBULB The word LIGHTBULB has appeared as an answer to at least 7 crossword clues on different crossword puzzles. Crossword clues for LIGHTBULB Showing 1 to 7 of 7 results Clue(s) *Thomas Edison and Joseph Swan Bright idea symbol Idea, in the comics Item suggested visually by the black squares in this puzzle's grid Shiner's mild swelling Threaded illuminator What may illuminate mild recall of unhappy sound?