The crossword solution for the term 'Pigeon or Dove' is COOER, which is an acronym for Columbidae Order, a scientific classification of birds that includes both pigeons and doves. Pigeons and doves are members of the same family, Columbidae, and share many similarities, such as their small size, short beaks, and plump bodies. They are found in a variety of habitats, from urban areas to forests, and can be found on every continent except Antarctica.