Using all letters

                                                                            disillusion

                                                                           disillusions

                                                                          The other words:

                                                                             disunion

                                                                               dulls

                                                                             illusion

                                                                             illusions

                                                                             insidious

                                                                              insoul

                                                                              insulin

                                                                             insulins

                                                                               louis

                                                                               lulls

                                                                               lulus

                                                                               nodus

                                                                             nonunion

                                                                             nonunions

                                                                               nouns

                                                                               nullo

                                                                               nulls

                                                                              odious

                                                                              sinuous

                                                                               sinus

                                                                             sinusoid

                                                                             sinusoids

                                                                              solidus

                                                                               souls

                                                                               sound

                                                                              sounds

                                                                               undid

                                                                               union

                                                                              unions

                                                                              unison

                                                                              unisons

                                                                              unsold

                                                                              unsound