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

Crossword clues for More fuliginous 7 letters:

SOOTIER: More fuliginous
SOOTY: Fuliginous.
SOOT: Fuliginous substance
SOOTIEST: Most fuliginous
SMOKIEST: Most fuliginous