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

Crossword clues for Christmas tree, often 4 letters:

PINE: Christmas tree, often
FIRS: Christmas trees, often
DOUGLASFIR: Christmas tree, often
CONIFER: Christmas tree, often
FIR: Christmas tree, often
CANDYCANE: Christmas tree decoration, often
SKIRT: It's often found under a Christmas tree