Using all letters

                                                                           effusiveness

                                                                             infusive

                                                                          The other words:

                                                                              effuse

                                                                              effuses

                                                                             effusive

                                                                               ennui

                                                                              ennuis

                                                                               ensue

                                                                              ensues

                                                                              funnies

                                                                             funniness

                                                                               fusee

                                                                              fusees

                                                                               fuses

                                                                              fusses

                                                                             fussiness

                                                                              infuse

                                                                              infuses

                                                                               issue

                                                                              issues

                                                                               nevus

                                                                               sensu

                                                                               sinus

                                                                              sinuses

                                                                               snuff

                                                                              snuffs

                                                                              suffuse

                                                                             suffuses

                                                                             sunniness

                                                                              uneven

                                                                            unevenness

                                                                              unifies

                                                                              unseen

                                                                               venue

                                                                              venues

                                                                               venus

                                                                             vesuvius