Foul smell is an unpleasant ODOR that can be caused by a variety of sources. The term is often used to describe odors that are particularly strong and unpleasant. Common crossword solutions for the term foul smell include STENCH (6 letters), REEK (4 letters), STINK (5 letters), ODOR (4 letters), and FETOR (5 letters). All of these words refer to an unpleasant smell, with STENCH being the strongest and FETOR being the most unpleasant.