The term DECAY WITH AN OFFENSIVE SMELL can be summarized by three crossword solutions: PUTREFY (7 letters), REEK (4 letters), and ROT (3 letters). PUTREFY is a verb meaning to decay or decompose, usually with an offensive smell. REEK is a verb meaning to emit an unpleasant odor, often associated with decay. ROT is a verb meaning to decay or decompose, usually with an offensive smell. All three words are used to describe the process of decaying with an offensive smell.