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

Crossword clues for Cause of congestion 8 letters:

ROADRAGE: Congestion may cause it
HEADCOLD: Cause of congestion
HEADCOLDCASE: Cause of congestion / Detective's challenge / Loony
RUSH2OURS: Causes of congestion
SINUSITIS: Cause of nasal congestion
ELKS: Causes of some Yellowstone traffic congestion