Crossword clues for the word: BOOSTER The word BOOSTER has appeared as an answer to at least 9 crossword clues on different crossword puzzles. Crossword clues for BOOSTER Showing 1 to 9 of 9 results Clue(s) Enthusiastic fan Follow-up shot Launch vehicle Rah-rah fan Rah-rah sort Supplementary dosage Third Covid jab Third shot, for many Type of rocket