ghoul hgoul gohul oghul hogul ohgul ghuol hguol guhol ughol hugol uhgol gouhl oguhl guohl ugohl oughl uoghl hougl ohugl huogl uhogl ouhgl uohgl gholu hgolu gohlu oghlu hoglu ohglu ghlou hglou glhou lghou hlgou lhgou golhu oglhu glohu lgohu olghu loghu holgu ohlgu hlogu lhogu olhgu lohgu ghulo hgulo guhlo ughlo huglo uhglo ghluo hgluo glhuo lghuo hlguo lhguo gulho uglho gluho lguho ulgho lugho hulgo uhlgo hlugo lhugo ulhgo luhgo goulh ogulh guolh ugolh ouglh uoglh goluh ogluh glouh lgouh olguh loguh guloh ugloh gluoh lguoh ulgoh lugoh oulgh uolgh olugh lough ulogh luogh houlg ohulg huolg uholg ouhlg uohlg holug ohlug hloug lhoug olhug lohug hulog uhlog hluog lhuog ulhog luhog oulhg uolhg oluhg louhg ulohg luohg
Note: these 'words' (valid or invalid) are all the permutations of the word ghoul. These words are obtained by scrambling the letters in ghoul.