bowels bowels /ˈbaʊlz/

noun

1. The center of the Earth  ( bowels )
   the center of the Earth
   

 bowel bowel /ˈbaʊəl/

noun

1. The part of the alimentary canal between the stomach and the anus  ( bowel , intestine , gut )
   the part of the alimentary canal between the stomach and the anus
    He had a feeling in his gut that something wasn't right.
   He had a feeling in his gut that something wasn't right.