spring psring srping rsping prsing rpsing spirng psirng siprng isprng pisrng ipsrng sripng rsipng sirpng isrpng rispng irspng prisng rpisng pirsng iprsng ripsng irpsng sprnig psrnig srpnig rspnig prsnig rpsnig spnrig psnrig snprig nsprig pnsrig npsrig srnpig rsnpig snrpig nsrpig rnspig nrspig prnsig rpnsig pnrsig nprsig rnpsig nrpsig spinrg psinrg sipnrg ispnrg pisnrg ipsnrg spnirg psnirg snpirg nspirg pnsirg npsirg sinprg isnprg sniprg nsiprg insprg nisprg pinsrg ipnsrg pnisrg npisrg inpsrg nipsrg srinpg rsinpg sirnpg isrnpg risnpg irsnpg srnipg rsnipg snripg nsripg rnsipg nrsipg sinrpg isnrpg snirpg nsirpg insrpg nisrpg rinspg irnspg rnispg nrispg inrspg nirspg prinsg rpinsg pirnsg iprnsg ripnsg irpnsg prnisg rpnisg pnrisg nprisg rnpisg nrpisg pinrsg ipnrsg pnirsg npirsg inprsg niprsg rinpsg irnpsg rnipsg nripsg inrpsg nirpsg sprign psrign srpign rspign prsign rpsign spirgn psirgn siprgn isprgn pisrgn ipsrgn sripgn rsipgn sirpgn isrpgn rispgn irspgn prisgn rpisgn pirsgn iprsgn ripsgn irpsgn sprgin psrgin srpgin rspgin prsgin rpsgin spgrin psgrin sgprin gsprin pgsrin gpsrin srgpin rsgpin sgrpin gsrpin rgspin grspin prgsin rpgsin pgrsin gprsin rgpsin grpsin spigrn psigrn sipgrn ispgrn pisgrn ipsgrn spgirn psgirn sgpirn gspirn pgsirn gpsirn sigprn isgprn sgiprn gsiprn igsprn gisprn pigsrn ipgsrn pgisrn gpisrn igpsrn gipsrn srigpn rsigpn sirgpn isrgpn risgpn irsgpn srgipn rsgipn sgripn gsripn rgsipn grsipn sigrpn isgrpn sgirpn gsirpn igsrpn gisrpn rigspn irgspn rgispn grispn igrspn girspn prigsn rpigsn pirgsn iprgsn ripgsn irpgsn prgisn rpgisn pgrisn gprisn rgpisn grpisn pigrsn ipgrsn pgirsn gpirsn igprsn giprsn rigpsn irgpsn rgipsn gripsn igrpsn girpsn sprngi psrngi srpngi rspngi prsngi rpsngi spnrgi psnrgi snprgi nsprgi pnsrgi npsrgi srnpgi rsnpgi snrpgi nsrpgi rnspgi nrspgi prnsgi rpnsgi pnrsgi nprsgi rnpsgi nrpsgi sprgni psrgni srpgni rspgni prsgni rpsgni spgrni psgrni sgprni gsprni pgsrni gpsrni srgpni rsgpni sgrpni gsrpni rgspni grspni prgsni rpgsni pgrsni gprsni rgpsni grpsni spngri psngri snpgri nspgri pnsgri npsgri spgnri psgnri sgpnri gspnri pgsnri gpsnri sngpri nsgpri sgnpri gsnpri ngspri gnspri pngsri npgsri pgnsri gpnsri ngpsri gnpsri srngpi rsngpi snrgpi nsrgpi rnsgpi nrsgpi srgnpi rsgnpi sgrnpi gsrnpi rgsnpi grsnpi sngrpi nsgrpi sgnrpi gsnrpi ngsrpi gnsrpi rngspi nrgspi rgnspi grnspi ngrspi gnrspi prngsi rpngsi pnrgsi nprgsi rnpgsi nrpgsi prgnsi rpgnsi pgrnsi gprnsi rgpnsi grpnsi pngrsi npgrsi pgnrsi gpnrsi ngprsi gnprsi rngpsi nrgpsi rgnpsi grnpsi ngrpsi gnrpsi spingr psingr sipngr ispngr pisngr ipsngr spnigr psnigr snpigr nspigr pnsigr npsigr sinpgr isnpgr snipgr nsipgr inspgr nispgr pinsgr ipnsgr pnisgr npisgr inpsgr nipsgr spignr psignr sipgnr ispgnr pisgnr ipsgnr spginr psginr sgpinr gspinr pgsinr gpsinr sigpnr isgpnr sgipnr gsipnr igspnr gispnr pigsnr ipgsnr pgisnr gpisnr igpsnr gipsnr spngir psngir snpgir nspgir pnsgir npsgir spgnir psgnir sgpnir gspnir pgsnir gpsnir sngpir nsgpir sgnpir gsnpir ngspir gnspir pngsir npgsir pgnsir gpnsir ngpsir gnpsir singpr isngpr snigpr nsigpr insgpr nisgpr signpr isgnpr sginpr gsinpr igsnpr gisnpr sngipr nsgipr sgnipr gsnipr ngsipr gnsipr ingspr nigspr ignspr ginspr ngispr gnispr pingsr ipngsr pnigsr npigsr inpgsr nipgsr pignsr ipgnsr pginsr gpinsr igpnsr gipnsr pngisr npgisr pgnisr gpnisr ngpisr gnpisr ingpsr nigpsr ignpsr ginpsr ngipsr gnipsr sringp rsingp sirngp isrngp risngp irsngp srnigp rsnigp snrigp nsrigp rnsigp nrsigp sinrgp isnrgp snirgp nsirgp insrgp nisrgp rinsgp irnsgp rnisgp nrisgp inrsgp nirsgp srignp rsignp sirgnp isrgnp risgnp irsgnp srginp rsginp sgrinp gsrinp rgsinp grsinp sigrnp isgrnp sgirnp gsirnp igsrnp gisrnp rigsnp irgsnp rgisnp grisnp igrsnp girsnp srngip rsngip snrgip nsrgip rnsgip nrsgip srgnip rsgnip sgrnip gsrnip rgsnip grsnip sngrip nsgrip sgnrip gsnrip ngsrip gnsrip rngsip nrgsip rgnsip grnsip ngrsip gnrsip singrp isngrp snigrp nsigrp insgrp nisgrp signrp isgnrp sginrp gsinrp igsnrp gisnrp sngirp nsgirp sgnirp gsnirp ngsirp gnsirp ingsrp nigsrp ignsrp ginsrp ngisrp gnisrp ringsp irngsp rnigsp nrigsp inrgsp nirgsp rignsp irgnsp rginsp grinsp igrnsp girnsp rngisp nrgisp rgnisp grnisp ngrisp gnrisp ingrsp nigrsp ignrsp ginrsp ngirsp gnirsp prings rpings pirngs iprngs ripngs irpngs prnigs rpnigs pnrigs nprigs rnpigs nrpigs pinrgs ipnrgs pnirgs npirgs inprgs niprgs rinpgs irnpgs rnipgs nripgs inrpgs nirpgs prigns rpigns pirgns iprgns ripgns irpgns prgins rpgins pgrins gprins rgpins grpins pigrns ipgrns pgirns gpirns igprns giprns rigpns irgpns rgipns gripns igrpns girpns prngis rpngis pnrgis nprgis rnpgis nrpgis prgnis rpgnis pgrnis gprnis rgpnis grpnis pngris npgris pgnris gpnris ngpris gnpris rngpis nrgpis rgnpis grnpis ngrpis gnrpis pingrs ipngrs pnigrs npigrs inpgrs nipgrs pignrs ipgnrs pginrs gpinrs igpnrs gipnrs pngirs npgirs pgnirs gpnirs ngpirs gnpirs ingprs nigprs ignprs ginprs ngiprs gniprs ringps irngps rnigps nrigps inrgps nirgps rignps irgnps rginps grinps igrnps girnps rngips nrgips rgnips grnips ngrips gnrips ingrps nigrps ignrps ginrps ngirps gnirps
Note: these 'words' (valid or invalid) are all the permutations of the word spring. These words are obtained by scrambling the letters in spring.