Using all letters

                                                                            eyewitness

                                                                           eyewitnesses

                                                                          The other words:

                                                                              entity

                                                                             intensity

                                                                               netty

                                                                               newsy

                                                                              ninety

                                                                               ninny

                                                                               nitty

                                                                              sinewy

                                                                               sissy

                                                                               styes

                                                                              teensy

                                                                              teentsy

                                                                               teeny

                                                                              tensity

                                                                               tenty

                                                                               testy

                                                                               tinny

                                                                               titty

                                                                              twenty

                                                                               twiny

                                                                              weensy

                                                                               weeny

                                                                               wenny

                                                                               winey

                                                                               witty

                                                                               yeses

                                                                              yesses

                                                                               yetis