Using all letters

                                                                            subnucleus

                                                                           subnucleuses

                                                                          The other words:

                                                                              beebee

                                                                              beebees

                                                                               belle

                                                                              belles

                                                                               bells

                                                                               benes

                                                                               bless

                                                                              blesses

                                                                             bluebell

                                                                             bluebells

                                                                             blueness

                                                                               blues

                                                                              bubble

                                                                              bubbles

                                                                               bulbs

                                                                              bulbul

                                                                              bulbuls

                                                                               bulls

                                                                               bunns

                                                                              bunsen

                                                                               buses

                                                                              busses

                                                                               celeb

                                                                              celebs

                                                                               clubs

                                                                              cubebs

                                                                               cubes

                                                                               lubes

                                                                              nebule

                                                                              nubble

                                                                              nubbles

                                                                               slubs

                                                                             snubness

                                                                               snubs

                                                                              subcell

                                                                             subcells

                                                                             sublessee

                                                                             succubus

                                                                            succubuses