heads ehads haeds aheds eahds aehds hedas ehdas hdeas dheas edhas dehas hades ahdes hdaes dhaes adhes dahes eadhs aedhs edahs deahs adehs daehs heasd ehasd haesd ahesd eahsd aehsd hesad ehsad hsead shead eshad sehad hased ahsed hsaed shaed ashed sahed eashd aeshd esahd seahd asehd saehd hedsa ehdsa hdesa dhesa edhsa dehsa hesda ehsda hseda sheda eshda sehda hdsea dhsea hsdea shdea dshea sdhea edsha desha esdha sedha dseha sdeha hadse ahdse hdase dhase adhse dahse hasde ahsde hsade shade ashde sahde hdsae dhsae hsdae shdae dshae sdhae adshe dashe asdhe sadhe dsahe sdahe eadsh aedsh edash deash adesh daesh easdh aesdh esadh seadh asedh saedh edsah desah esdah sedah dseah sdeah adseh daseh asdeh sadeh dsaeh sdaeh
Note: these 'words' (valid or invalid) are all the permutations of the word heads. These words are obtained by scrambling the letters in heads.