stairs tsairs satirs astirs tasirs atsirs stiars tsiars sitars istars tisars itsars saitrs asitrs siatrs isatrs aistrs iastrs taisrs atisrs tiasrs itasrs aitsrs iatsrs staris tsaris satris astris tasris atsris strais tsrais srtais rstais trsais rtsais sartis asrtis sratis rsatis arstis rastis tarsis atrsis trasis rtasis artsis ratsis stiras tsiras sitras istras tisras itsras strias tsrias srtias rstias trsias rtsias sirtas isrtas sritas rsitas irstas ristas tirsas itrsas trisas rtisas irtsas ritsas sairts asirts siarts isarts aisrts iasrts sarits asrits sraits rsaits arsits rasits sirats israts sriats rsiats irsats risats airsts iarsts arists raists irasts riasts tairss atirss tiarss itarss aitrss iatrss tariss atriss traiss rtaiss artiss ratiss tirass itrass triass rtiass irtass ritass airtss iartss aritss raitss iratss riatss staisr tsaisr satisr astisr tasisr atsisr stiasr tsiasr sitasr istasr tisasr itsasr saitsr asitsr siatsr isatsr aistsr iastsr taissr atissr tiassr itassr aitssr iatssr stasir tsasir satsir astsir tassir atssir stsair tssair sstair sstair tssair stsair sastir asstir ssatir ssatir asstir sastir tassir atssir tsasir stasir astsir satsir stisar tsisar sitsar istsar tissar itssar stsiar tssiar sstiar sstiar tssiar stsiar sistar isstar ssitar ssitar isstar sistar tissar itssar tsisar stisar istsar sitsar saistr asistr siastr isastr aisstr iasstr sasitr assitr ssaitr ssaitr assitr sasitr sisatr issatr ssiatr ssiatr issatr sisatr aisstr iasstr asistr saistr isastr siastr taissr atissr tiassr itassr aitssr iatssr tasisr atsisr tsaisr staisr astisr satisr tisasr itsasr tsiasr stiasr istasr sitasr aistsr iastsr asitsr saitsr isatsr siatsr starsi tsarsi satrsi astrsi tasrsi atsrsi strasi tsrasi srtasi rstasi trsasi rtsasi sartsi asrtsi sratsi rsatsi arstsi rastsi tarssi atrssi trassi rtassi artssi ratssi stasri tsasri satsri astsri tassri atssri stsari tssari sstari sstari tssari stsari sastri asstri ssatri ssatri asstri sastri tassri atssri tsasri stasri astsri satsri strsai tsrsai srtsai rstsai trssai rtssai stsrai tssrai sstrai sstrai tssrai stsrai srstai rsstai ssrtai ssrtai rsstai srstai trssai rtssai tsrsai strsai rstsai srtsai sarsti asrsti srasti rsasti arssti rassti sasrti assrti ssarti ssarti assrti sasrti srsati rssati ssrati ssrati rssati srsati arssti rassti asrsti sarsti rsasti srasti tarssi atrssi trassi rtassi artssi ratssi tasrsi atsrsi tsarsi starsi astrsi satrsi trsasi rtsasi tsrasi strasi rstasi srtasi arstsi rastsi asrtsi sartsi rsatsi sratsi stirsa tsirsa sitrsa istrsa tisrsa itsrsa strisa tsrisa srtisa rstisa trsisa rtsisa sirtsa isrtsa sritsa rsitsa irstsa ristsa tirssa itrssa trissa rtissa irtssa ritssa stisra tsisra sitsra istsra tissra itssra stsira tssira sstira sstira tssira stsira sistra isstra ssitra ssitra isstra sistra tissra itssra tsisra stisra istsra sitsra strsia tsrsia srtsia rstsia trssia rtssia stsria tssria sstria sstria tssria stsria srstia rsstia ssrtia ssrtia rsstia srstia trssia rtssia tsrsia strsia rstsia srtsia sirsta isrsta srista rsista irssta rissta sisrta issrta ssirta ssirta issrta sisrta srsita rssita ssrita ssrita rssita srsita irssta rissta isrsta sirsta rsista srista tirssa itrssa trissa rtissa irtssa ritssa tisrsa itsrsa tsirsa stirsa istrsa sitrsa trsisa rtsisa tsrisa strisa rstisa srtisa irstsa ristsa isrtsa sirtsa rsitsa sritsa sairst asirst siarst isarst aisrst iasrst sarist asrist sraist rsaist arsist rasist sirast israst sriast rsiast irsast risast airsst iarsst arisst raisst irasst riasst saisrt asisrt siasrt isasrt aissrt iassrt sasirt assirt ssairt ssairt assirt sasirt sisart issart ssiart ssiart issart sisart aissrt iassrt asisrt saisrt isasrt siasrt sarsit asrsit srasit rsasit arssit rassit sasrit assrit ssarit ssarit assrit sasrit srsait rssait ssrait ssrait rssait srsait arssit rassit asrsit sarsit rsasit srasit sirsat isrsat srisat rsisat irssat rissat sisrat issrat ssirat ssirat issrat sisrat srsiat rssiat ssriat ssriat rssiat srsiat irssat rissat isrsat sirsat rsisat srisat airsst iarsst arisst raisst irasst riasst aisrst iasrst asirst sairst isarst siarst arsist rasist asrist sarist rsaist sraist irsast risast israst sirast rsiast sriast tairss atirss tiarss itarss aitrss iatrss tariss atriss traiss rtaiss artiss ratiss tirass itrass triass rtiass irtass ritass airtss iartss aritss raitss iratss riatss taisrs atisrs tiasrs itasrs aitsrs iatsrs tasirs atsirs tsairs stairs astirs satirs tisars itsars tsiars stiars istars sitars aistrs iastrs asitrs saitrs isatrs siatrs tarsis atrsis trasis rtasis artsis ratsis tasris atsris tsaris staris astris satris trsais rtsais tsrais strais rstais srtais arstis rastis asrtis sartis rsatis sratis tirsas itrsas trisas rtisas irtsas ritsas tisras itsras tsiras stiras istras sitras trsias rtsias tsrias strias rstias srtias irstas ristas isrtas sirtas rsitas sritas airsts iarsts arists raists irasts riasts aisrts iasrts asirts sairts isarts siarts arsits rasits asrits sarits rsaits sraits irsats risats israts sirats rsiats sriats
Note: these 'words' (valid or invalid) are all the permutations of the word stairs. These words are obtained by scrambling the letters in stairs.