opsins posins ospins sopins psoins spoins opisns poisns oipsns iopsns piosns iposns osipns soipns oispns iospns siopns isopns psions spions pisons ipsons sipons ispons opsnis posnis ospnis sopnis psonis sponis opnsis ponsis onpsis nopsis pnosis nposis osnpis sonpis onspis nospis snopis nsopis psnois spnois pnsois npsois snpois nspois opinss poinss oipnss iopnss pionss iponss opniss poniss onpiss nopiss pnoiss npoiss oinpss ionpss onipss noipss inopss niopss pinoss ipnoss pnioss npioss inposs niposs osinps soinps oisnps iosnps sionps isonps osnips sonips onsips nosips snoips nsoips oinsps ionsps onisps noisps inosps niosps sinops isnops sniops nsiops insops nisops psinos spinos pisnos ipsnos sipnos ispnos psnios spnios pnsios npsios snpios nspios pinsos ipnsos pnisos npisos inpsos nipsos sinpos isnpos snipos nsipos inspos nispos opsisn posisn ospisn sopisn psoisn spoisn opissn poissn oipssn iopssn piossn ipossn osipsn soipsn oispsn iospsn siopsn isopsn psiosn spiosn pisosn ipsosn siposn isposn opssin possin ospsin sopsin psosin sposin opssin possin ospsin sopsin psosin sposin osspin sospin osspin sospin ssopin ssopin pssoin spsoin pssoin spsoin sspoin sspoin opissn poissn oipssn iopssn piossn ipossn opsisn posisn ospisn sopisn psoisn spoisn oispsn iospsn osipsn soipsn isopsn siopsn pisosn ipsosn psiosn spiosn isposn siposn osispn soispn oisspn iosspn siospn isospn ossipn sosipn ossipn sosipn ssoipn ssoipn oisspn iosspn osispn soispn isospn siospn sisopn issopn ssiopn ssiopn issopn sisopn psison spison pisson ipsson sipson ispson pssion spsion pssion spsion sspion sspion pisson ipsson psison spison ispson sipson sispon isspon ssipon ssipon isspon sispon opsnsi posnsi ospnsi sopnsi psonsi sponsi opnssi ponssi onpssi nopssi pnossi npossi osnpsi sonpsi onspsi nospsi snopsi nsopsi psnosi spnosi pnsosi npsosi snposi nsposi opssni possni ospsni sopsni psosni sposni opssni possni ospsni sopsni psosni sposni osspni sospni osspni sospni ssopni ssopni pssoni spsoni pssoni spsoni ssponi ssponi opnssi ponssi onpssi nopssi pnossi npossi opsnsi posnsi ospnsi sopnsi psonsi sponsi onspsi nospsi osnpsi sonpsi nsopsi snopsi pnsosi npsosi psnosi spnosi nsposi snposi osnspi sonspi onsspi nosspi snospi nsospi ossnpi sosnpi ossnpi sosnpi ssonpi ssonpi onsspi nosspi osnspi sonspi nsospi snospi snsopi nssopi ssnopi ssnopi nssopi snsopi psnsoi spnsoi pnssoi npssoi snpsoi nspsoi pssnoi spsnoi pssnoi spsnoi sspnoi sspnoi pnssoi npssoi psnsoi spnsoi nspsoi snpsoi snspoi nsspoi ssnpoi ssnpoi nsspoi snspoi opinss poinss oipnss iopnss pionss iponss opniss poniss onpiss nopiss pnoiss npoiss oinpss ionpss onipss noipss inopss niopss pinoss ipnoss pnioss npioss inposs niposs opisns poisns oipsns iopsns piosns iposns opsins posins ospins sopins psoins spoins oispns iospns osipns soipns isopns siopns pisons ipsons psions spions ispons sipons opnsis ponsis onpsis nopsis pnosis nposis opsnis posnis ospnis sopnis psonis sponis onspis nospis osnpis sonpis nsopis snopis pnsois npsois psnois spnois nspois snpois oinsps ionsps onisps noisps inosps niosps oisnps iosnps osinps soinps isonps sionps onsips nosips osnips sonips nsoips snoips insops nisops isnops sinops nsiops sniops pinsos ipnsos pnisos npisos inpsos nipsos pisnos ipsnos psinos spinos ispnos sipnos pnsios npsios psnios spnios nspios snpios inspos nispos isnpos sinpos nsipos snipos osinsp soinsp oisnsp iosnsp sionsp isonsp osnisp sonisp onsisp nosisp snoisp nsoisp oinssp ionssp onissp noissp inossp niossp sinosp isnosp sniosp nsiosp insosp nisosp osisnp soisnp oissnp iossnp siosnp isosnp ossinp sosinp ossinp sosinp ssoinp ssoinp oissnp iossnp osisnp soisnp isosnp siosnp sisonp issonp ssionp ssionp issonp sisonp osnsip sonsip onssip nossip snosip nsosip ossnip sosnip ossnip sosnip ssonip ssonip onssip nossip osnsip sonsip nsosip snosip snsoip nssoip ssnoip ssnoip nssoip snsoip oinssp ionssp onissp noissp inossp niossp oisnsp iosnsp osinsp soinsp isonsp sionsp onsisp nosisp osnisp sonisp nsoisp snoisp insosp nisosp isnosp sinosp nsiosp sniosp sinsop isnsop snisop nsisop inssop nissop sisnop issnop ssinop ssinop issnop sisnop snsiop nssiop ssniop ssniop nssiop snsiop inssop nissop isnsop sinsop nsisop snisop psinso spinso pisnso ipsnso sipnso ispnso psniso spniso pnsiso npsiso snpiso nspiso pinsso ipnsso pnisso npisso inpsso nipsso sinpso isnpso snipso nsipso inspso nispso psisno spisno pissno ipssno sipsno ispsno pssino spsino pssino spsino sspino sspino pissno ipssno psisno spisno ispsno sipsno sispno isspno ssipno ssipno isspno sispno psnsio spnsio pnssio npssio snpsio nspsio pssnio spsnio pssnio spsnio sspnio sspnio pnssio npssio psnsio spnsio nspsio snpsio snspio nsspio ssnpio ssnpio nsspio snspio pinsso ipnsso pnisso npisso inpsso nipsso pisnso ipsnso psinso spinso ispnso sipnso pnsiso npsiso psniso spniso nspiso snpiso inspso nispso isnpso sinpso nsipso snipso sinspo isnspo snispo nsispo insspo nisspo sisnpo issnpo ssinpo ssinpo issnpo sisnpo snsipo nssipo ssnipo ssnipo nssipo snsipo insspo nisspo isnspo sinspo nsispo snispo
Note: these 'words' (valid or invalid) are all the permutations of the word opsins. These words are obtained by scrambling the letters in opsins.