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

Crossword clues for Part of a regatta. 4 letters:

RACE: Part of a regatta.
ROWED: Took part in a regatta
OARED: Took part in a regatta
SAILED: Took part in a regatta
OARED: Took part in a regatta, perhaps
OARED: Took part in the Henley Royal Regatta