thros htros trhos rthos hrtos rhtos thors htors tohrs othrs hotrs ohtrs trohs rtohs torhs otrhs roths orths hrots rhots horts ohrts rohts orhts thrso htrso trhso rthso hrtso rhtso thsro htsro tshro sthro hstro shtro trsho rtsho tsrho strho rstho srtho hrsto rhsto hsrto shrto rshto srhto thosr htosr tohsr othsr hotsr ohtsr thsor htsor tshor sthor hstor shtor toshr otshr tsohr stohr osthr sothr hostr ohstr hsotr shotr oshtr sohtr trosh rtosh torsh otrsh rotsh ortsh trsoh rtsoh tsroh stroh rstoh srtoh tosrh otsrh tsorh storh ostrh sotrh rosth orsth rsoth sroth osrth sorth hrost rhost horst ohrst rohst orhst hrsot rhsot hsrot shrot rshot srhot hosrt ohsrt hsort short oshrt sohrt rosht orsht rsoht sroht osrht sorht
Note: these 'words' (valid or invalid) are all the permutations of the word thros. These words are obtained by scrambling the letters in thros.