What do all of these words Have in Common?____

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Across
  1. 1. Bruce Wayne's biological son
  2. 2. A small knife
  3. 4. an official system of principles or tenets concerning faith, morals, and behavior
  4. 5. In the movie "The Batman" The Riddler was caught in a ___
Down
  1. 1. Man's best friend
  2. 2. Batman's IQ is lower that 60 making him ____
  3. 3. A bakers ___
  4. 5. 7th word in the opening