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

Crossword clues for High water marks:

ACME: High-water mark
ACMES: High water marks
LEVEE: Structure with high-water marks
FLOODLINE: High-water mark
FLOODLINE: High-water mark, literally
TIDELINE: High-water mark