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

Crossword clues for Board supports 9 letters:

SAWHORSES: Board supports
LATH: Plaster support board
BEDSLAT: Mattress-supporting board
SAWHORSE: Board supporter
PTA: Org. that may support a school board
STUDS: Supports for gypsum boards