nighs inghs ngihs gnihs ignhs ginhs nihgs inhgs nhigs hnigs ihngs hings nghis gnhis nhgis hngis ghnis hgnis ighns gihns ihgns higns ghins hgins nigsh ingsh ngish gnish ignsh ginsh nisgh insgh nsigh snigh isngh singh ngsih gnsih nsgih sngih gsnih sgnih igsnh gisnh isgnh signh gsinh sginh nihsg inhsg nhisg hnisg ihnsg hinsg nishg inshg nsihg snihg isnhg sinhg nhsig hnsig nshig snhig hsnig shnig ihsng hisng ishng sihng hsing shing nghsi gnhsi nhgsi hngsi ghnsi hgnsi ngshi gnshi nsghi snghi gsnhi sgnhi nhsgi hnsgi nshgi snhgi hsngi shngi ghsni hgsni gshni sghni hsgni shgni ighsn gihsn ihgsn higsn ghisn hgisn igshn gishn isghn sighn gsihn sgihn ihsgn hisgn ishgn sihgn hsign shign ghsin hgsin gshin sghin hsgin shgin
Note: these 'words' (valid or invalid) are all the permutations of the word nighs. These words are obtained by scrambling the letters in nighs.