Using all letters

                                                                             actuation

                                                                           annunciation

                                                                              auction

                                                                              caution

                                                                             continua

                                                                            continuant

                                                                           continuation

                                                                             countian

                                                                          noncontinuation

                                                                          The other words:

                                                                              account

                                                                            accountant

                                                                             annuitant

                                                                             antiunion

                                                                             cocoanut

                                                                              coconut

                                                                             continuo

                                                                               count

                                                                               cunni

                                                                               cutin

                                                                              cutout

                                                                              intuit

                                                                             intuition

                                                                              intuito

                                                                             nonunion

                                                                              nuncio

                                                                               taunt

                                                                              toucan

                                                                              tuition

                                                                               tunic

                                                                               tutti

                                                                              unction

                                                                               uncut

                                                                               union