airth iarth arith raith irath riath aitrh iatrh atirh tairh itarh tiarh artih ratih atrih tarih rtaih traih irtah ritah itrah tirah rtiah triah airht iarht ariht raiht iraht riaht aihrt iahrt ahirt hairt ihart hiart arhit rahit ahrit harit rhait hrait irhat rihat ihrat hirat rhiat hriat aithr iathr atihr taihr itahr tiahr aihtr iahtr ahitr haitr ihatr hiatr athir tahir ahtir hatir thair htair ithar tihar ihtar hitar thiar htiar arthi rathi atrhi tarhi rtahi trahi arhti rahti ahrti harti rhati hrati athri tahri ahtri hatri thari htari rthai trhai rhtai hrtai thrai htrai irtha ritha itrha tirha rtiha triha irhta rihta ihrta hirta rhita hrita ithra tihra ihtra hitra thira htira rthia trhia rhtia hrtia thria htria
Note: these 'words' (valid or invalid) are all the permutations of the word airth. These words are obtained by scrambling the letters in airth.