Using all letters

                                                                           multimillion

                                                                          The other words:

                                                                             intuition

                                                                              intuito

                                                                              ionium

                                                                              lotion

                                                                               lotto

                                                                              million

                                                                              milton

                                                                              minion

                                                                               molto

                                                                             monition

                                                                              moonlit

                                                                              motion

                                                                               motto

                                                                              moulin

                                                                               moult

                                                                               mount

                                                                              mouton

                                                                              mullion

                                                                               multo

                                                                             munition

                                                                              mutton

                                                                               ninon

                                                                             nonunion

                                                                              notion

                                                                               nullo

                                                                              omnium

                                                                               onion

                                                                              toluol

                                                                              tomtit

                                                                              tuition

                                                                              ultimo

                                                                               union