What Nonsense!' is an expression used to express disbelief or disapproval. The crossword solutions for this term are POOH (4 letters), BAH (3 letters), BOSH (4 letters), and RUBBISH (7 letters). These words are all synonyms for nonsense, with POOH being a phrase popularized by A.A. Milne's character Winnie the POOH, BAH being an exclamation of disbelief, BOSH being a British slang term for nonsense, and RUBBISH being a more general term for something that is worthless or nonsensical.