Using all letters

                                                                            elusiveness

                                                                           illusiveness

                                                                              unveils

                                                                          The other words:

                                                                              elusive

                                                                               ennui

                                                                              ennuis

                                                                               ensue

                                                                              ensues

                                                                             illusive

                                                                              insulin

                                                                             insulins

                                                                               issue

                                                                             issueless

                                                                              issues

                                                                               lulls

                                                                               lulus

                                                                               lunes

                                                                              lunies

                                                                               nevus

                                                                               nulls

                                                                               sensu

                                                                               sinus

                                                                              sinuses

                                                                               slues

                                                                              sullen

                                                                            sullenness

                                                                              sullies

                                                                              sunless

                                                                             sunniness

                                                                              uneven

                                                                            unevenness

                                                                              unless

                                                                              unseen

                                                                              unveil

                                                                              useless

                                                                            uselessness

                                                                              veinule

                                                                               venue

                                                                              venues

                                                                              venules

                                                                               venus

                                                                             vesuvius

                                                                              villus