Using all letters

                                                                              combing

                                                                             combining

                                                                           noncombining

                                                                          The other words:

                                                                              bombing

                                                                              booming

                                                                               combo

                                                                               comic

                                                                              coming

                                                                              common

                                                                               coomb

                                                                              gnomic

                                                                              gnomon

                                                                             gnomonic

                                                                               gombo

                                                                             imbibing

                                                                             incoming

                                                                              mignon

                                                                               mimic

                                                                              miming

                                                                              mincing

                                                                               minim

                                                                              mining

                                                                              minion

                                                                              mobbing

                                                                              mooing

                                                                              mooning

                                                                               nimbi

                                                                              noncom

                                                                             oncoming