thoro htoro tohro othro hotro ohtro throo htroo trhoo rthoo hrtoo rhtoo torho otrho troho rtoho ortho rotho horto ohrto hroto rhoto orhto rohto thoor htoor tohor othor hotor ohtor thoor htoor tohor othor hotor ohtor toohr otohr toohr otohr oothr oothr hootr ohotr hootr ohotr oohtr oohtr throo htroo trhoo rthoo hrtoo rhtoo thoro htoro tohro othro hotro ohtro troho rtoho torho otrho rotho ortho hroto rhoto horto ohrto rohto orhto toroh otroh trooh rtooh ortoh rotoh toorh otorh toorh otorh ootrh ootrh trooh rtooh toroh otroh rotoh ortoh oroth rooth oorth oorth rooth oroth horot ohrot hroot rhoot orhot rohot hoort ohort hoort ohort oohrt oohrt hroot rhoot horot ohrot rohot orhot oroht rooht oorht oorht rooht oroht
Note: these 'words' (valid or invalid) are all the permutations of the word thoro. These words are obtained by scrambling the letters in thoro.