The term 'NEIGHBOR OF COLO.' can be solved by three different crossword solutions: NEB (3 letters), NEBR (4 letters), and NMEX (4 letters). NEB stands for Nebraska, a state in the Midwestern United States. Nebraska borders Colorado to the east and is thus a neighbor of Colorado. NEBR stands for Nebraska River, a tributary of the Missouri River that flows through Nebraska. NMEX stands for Nuevo Mexico, the Spanish name for New Mexico, a state in the southwestern United States. New Mexico borders Colorado to the south and is also a neighbor of Colorado.