north onrth nroth rnoth ornth ronth notrh ontrh ntorh tnorh otnrh tonrh nrtoh rntoh ntroh tnroh rtnoh trnoh ortnh rotnh otrnh tornh rtonh tronh norht onrht nroht rnoht ornht ronht nohrt onhrt nhort hnort ohnrt honrt nrhot rnhot nhrot hnrot rhnot hrnot orhnt rohnt ohrnt hornt rhont hront nothr onthr ntohr tnohr otnhr tonhr nohtr onhtr nhotr hnotr ohntr hontr nthor tnhor nhtor hntor thnor htnor othnr tohnr ohtnr hotnr thonr htonr nrtho rntho ntrho tnrho rtnho trnho nrhto rnhto nhrto hnrto rhnto hrnto nthro tnhro nhtro hntro thnro htnro rthno trhno rhtno hrtno thrno htrno orthn rothn otrhn torhn rtohn trohn orhtn rohtn ohrtn hortn rhotn hrotn othrn tohrn ohtrn hotrn thorn htorn rthon trhon rhton hrton thron htron
Note: these 'words' (valid or invalid) are all the permutations of the word north. These words are obtained by scrambling the letters in north.