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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Door-opener:

CARDKEY: High-tech door-opener
KEY: Door-opening thing
SESAME: Magic door-opening word.
LATCHKEY: Door-opener
MAID: Door-opener
TREADLE: Busman's door-opening item
LETME: Door-opening words