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