earth aerth erath reath areth raeth eatrh aetrh etarh tearh aterh taerh ertah retah etrah terah rteah treah arteh rateh atreh tareh rtaeh traeh earht aerht eraht reaht areht raeht eahrt aehrt ehart heart ahert haert erhat rehat ehrat herat rheat hreat arhet rahet ahret haret rhaet hraet eathr aethr etahr teahr atehr taehr eahtr aehtr ehatr heatr ahetr haetr ethar tehar ehtar hetar thear htear ather taher ahter hater thaer htaer ertha retha etrha terha rteha treha erhta rehta ehrta herta rheta hreta ethra tehra ehtra hetra thera htera rthea trhea rhtea hrtea threa htrea arthe rathe atrhe tarhe rtahe trahe arhte rahte ahrte harte rhate hrate athre tahre ahtre hatre thare htare rthae trhae rhtae hrtae thrae htrae
Note: these 'words' (valid or invalid) are all the permutations of the word earth. These words are obtained by scrambling the letters in earth.