Using all letters

                                                                           phototrophic

                                                                            phototropic

                                                                              trophic

                                                                          The other words:

                                                                              chichi

                                                                               chico

                                                                               chirp

                                                                               choir

                                                                              choric

                                                                             cirrhotic

                                                                              cohort

                                                                               cooch

                                                                              crotch

                                                                               hippo

                                                                               hitch

                                                                               hooch

                                                                              hootch

                                                                              horror

                                                                            hotchpotch

                                                                               ichor

                                                                              orphic

                                                                               ortho

                                                                              photic

                                                                               photo

                                                                               pitch

                                                                               pooch

                                                                               porch

                                                                               thoro

                                                                               thorp

                                                                               thrip

                                                                               tooth

                                                                               torch

                                                                             trichroic

                                                                               troth