Using all letters

                                                                             injurious

                                                                              juniors

                                                                           noninjurious

                                                                          The other words:

                                                                               inurn

                                                                              inurns

                                                                               irons

                                                                               jinni

                                                                               jinns

                                                                               joins

                                                                              junior

                                                                               ninon

                                                                             nonunion

                                                                             nonunions

                                                                               noons

                                                                               nouns

                                                                               onion

                                                                              onions

                                                                               orion

                                                                              orison

                                                                              orisons

                                                                               rosin

                                                                             rosinous

                                                                              rosins

                                                                              ruinous

                                                                               ruins

                                                                              sinuous

                                                                               sinus

                                                                              sojourn

                                                                             sojourns

                                                                             sonorous

                                                                               union

                                                                              unions

                                                                              unison

                                                                              unisons