Using all letters

                                                                           enfeeblement

                                                                          The other words:

                                                                              beebee

                                                                              beetle

                                                                              befell

                                                                               belle

                                                                              bellmen

                                                                               betel

                                                                               blent

                                                                              effete

                                                                              element

                                                                               ellen

                                                                              emblem

                                                                               emmet

                                                                             enfeeble

                                                                              entente

                                                                              feeble

                                                                               femme

                                                                              fennel

                                                                              fettle

                                                                               fleet

                                                                              lenten

                                                                               melee

                                                                              mettle

                                                                              nettle

                                                                             tenement

                                                                               tenet