vow

OATH
PROMISE
List of words for the clue vow from the crossword:
IDO OBEY NUN ALTAR SWEAR POORER PLEDGE MONK IOU WORSE THEE SAIDIDO PROMISER PLIGHT IDOS HONOR CONSECRATE CELIBATE
WordClue
VOWpromise or oath
PLEDGEsolemn promise to do something
COUPONvoucher
OATHvow, pledge