Crossword clues for the word: BOOSTERS The word BOOSTERS has appeared as an answer to at least 9 crossword clues on different crossword puzzles. Crossword clues for BOOSTERS Showing 1 to 9 of 9 results Clue(s) "Immunization shots, e.g." Ardent fans Devices for rocket propulsion. Hip ghosts? Moon shot stages Opposite of the knockers. Promoters: Colloq. Some vaccine shots Stages of space exploration