uncurb nucurb ucnurb cunurb ncuurb cnuurb unucrb nuucrb uuncrb uuncrb nuucrb unucrb ucunrb cuunrb uucnrb uucnrb cuunrb ucunrb ncuurb cnuurb nucurb uncurb cunurb ucnurb uncrub nucrub ucnrub cunrub ncurub cnurub unrcub nurcub urncub runcub nrucub rnucub ucrnub curnub urcnub rucnub crunub rcunub ncruub cnruub nrcuub rncuub crnuub rcnuub unurcb nuurcb uunrcb uunrcb nuurcb unurcb unrucb nurucb urnucb runucb nruucb rnuucb uurncb uurncb uruncb ruuncb uruncb ruuncb nurucb unrucb nruucb rnuucb urnucb runucb ucurnb cuurnb uucrnb uucrnb cuurnb ucurnb ucrunb curunb urcunb rucunb cruunb rcuunb uurcnb uurcnb urucnb ruucnb urucnb ruucnb curunb ucrunb cruunb rcuunb urcunb rucunb ncurub cnurub nucrub uncrub cunrub ucnrub ncruub cnruub nrcuub rncuub crnuub rcnuub nurcub unrcub nrucub rnucub urncub runcub curnub ucrnub crunub rcunub urcnub rucnub uncubr nucubr ucnubr cunubr ncuubr cnuubr unucbr nuucbr uuncbr uuncbr nuucbr unucbr ucunbr cuunbr uucnbr uucnbr cuunbr ucunbr ncuubr cnuubr nucubr uncubr cunubr ucnubr uncbur nucbur ucnbur cunbur ncubur cnubur unbcur nubcur ubncur buncur nbucur bnucur ucbnur cubnur ubcnur bucnur cbunur bcunur ncbuur cnbuur nbcuur bncuur cbnuur bcnuur unubcr nuubcr uunbcr uunbcr nuubcr unubcr unbucr nubucr ubnucr bunucr nbuucr bnuucr uubncr uubncr ubuncr buuncr ubuncr buuncr nubucr unbucr nbuucr bnuucr ubnucr bunucr ucubnr cuubnr uucbnr uucbnr cuubnr ucubnr ucbunr cubunr ubcunr bucunr cbuunr bcuunr uubcnr uubcnr ubucnr buucnr ubucnr buucnr cubunr ucbunr cbuunr bcuunr ubcunr bucunr ncubur cnubur nucbur uncbur cunbur ucnbur ncbuur cnbuur nbcuur bncuur cbnuur bcnuur nubcur unbcur nbucur bnucur ubncur buncur cubnur ucbnur cbunur bcunur ubcnur bucnur uncrbu nucrbu ucnrbu cunrbu ncurbu cnurbu unrcbu nurcbu urncbu runcbu nrucbu rnucbu ucrnbu curnbu urcnbu rucnbu crunbu rcunbu ncrubu cnrubu nrcubu rncubu crnubu rcnubu uncbru nucbru ucnbru cunbru ncubru cnubru unbcru nubcru ubncru buncru nbucru bnucru ucbnru cubnru ubcnru bucnru cbunru bcunru ncburu cnburu nbcuru bncuru cbnuru bcnuru unrbcu nurbcu urnbcu runbcu nrubcu rnubcu unbrcu nubrcu ubnrcu bunrcu nburcu bnurcu urbncu rubncu ubrncu burncu rbuncu bruncu nrbucu rnbucu nbrucu bnrucu rbnucu brnucu ucrbnu curbnu urcbnu rucbnu crubnu rcubnu ucbrnu cubrnu ubcrnu bucrnu cburnu bcurnu urbcnu rubcnu ubrcnu burcnu rbucnu brucnu crbunu rcbunu cbrunu bcrunu rbcunu brcunu ncrbuu cnrbuu nrcbuu rncbuu crnbuu rcnbuu ncbruu cnbruu nbcruu bncruu cbnruu bcnruu nrbcuu rnbcuu nbrcuu bnrcuu rbncuu brncuu crbnuu rcbnuu cbrnuu bcrnuu rbcnuu brcnuu unurbc nuurbc uunrbc uunrbc nuurbc unurbc unrubc nurubc urnubc runubc nruubc rnuubc uurnbc uurnbc urunbc ruunbc urunbc ruunbc nurubc unrubc nruubc rnuubc urnubc runubc unubrc nuubrc uunbrc uunbrc nuubrc unubrc unburc nuburc ubnurc bunurc nbuurc bnuurc uubnrc uubnrc ubunrc buunrc ubunrc buunrc nuburc unburc nbuurc bnuurc ubnurc bunurc unrbuc nurbuc urnbuc runbuc nrubuc rnubuc unbruc nubruc ubnruc bunruc nburuc bnuruc urbnuc rubnuc ubrnuc burnuc rbunuc brunuc nrbuuc rnbuuc nbruuc bnruuc rbnuuc brnuuc uurbnc uurbnc urubnc ruubnc urubnc ruubnc uubrnc uubrnc uburnc buurnc uburnc buurnc urbunc rubunc ubrunc burunc rbuunc bruunc urbunc rubunc ubrunc burunc rbuunc bruunc nurbuc unrbuc nrubuc rnubuc urnbuc runbuc nubruc unbruc nburuc bnuruc ubnruc bunruc nrbuuc rnbuuc nbruuc bnruuc rbnuuc brnuuc urbnuc rubnuc ubrnuc burnuc rbunuc brunuc ucurbn cuurbn uucrbn uucrbn cuurbn ucurbn ucrubn curubn urcubn rucubn cruubn rcuubn uurcbn uurcbn urucbn ruucbn urucbn ruucbn curubn ucrubn cruubn rcuubn urcubn rucubn ucubrn cuubrn uucbrn uucbrn cuubrn ucubrn ucburn cuburn ubcurn bucurn cbuurn bcuurn uubcrn uubcrn ubucrn buucrn ubucrn buucrn cuburn ucburn cbuurn bcuurn ubcurn bucurn ucrbun curbun urcbun rucbun crubun rcubun ucbrun cubrun ubcrun bucrun cburun bcurun urbcun rubcun ubrcun burcun rbucun brucun crbuun rcbuun cbruun bcruun rbcuun brcuun uurbcn uurbcn urubcn ruubcn urubcn ruubcn uubrcn uubrcn uburcn buurcn uburcn buurcn urbucn rubucn ubrucn burucn rbuucn bruucn urbucn rubucn ubrucn burucn rbuucn bruucn curbun ucrbun crubun rcubun urcbun rucbun cubrun ucbrun cburun bcurun ubcrun bucrun crbuun rcbuun cbruun bcruun rbcuun brcuun urbcun rubcun ubrcun burcun rbucun brucun ncurbu cnurbu nucrbu uncrbu cunrbu ucnrbu ncrubu cnrubu nrcubu rncubu crnubu rcnubu nurcbu unrcbu nrucbu rnucbu urncbu runcbu curnbu ucrnbu crunbu rcunbu urcnbu rucnbu ncubru cnubru nucbru uncbru cunbru ucnbru ncburu cnburu nbcuru bncuru cbnuru bcnuru nubcru unbcru nbucru bnucru ubncru buncru cubnru ucbnru cbunru bcunru ubcnru bucnru ncrbuu cnrbuu nrcbuu rncbuu crnbuu rcnbuu ncbruu cnbruu nbcruu bncruu cbnruu bcnruu nrbcuu rnbcuu nbrcuu bnrcuu rbncuu brncuu crbnuu rcbnuu cbrnuu bcrnuu rbcnuu brcnuu nurbcu unrbcu nrubcu rnubcu urnbcu runbcu nubrcu unbrcu nburcu bnurcu ubnrcu bunrcu nrbucu rnbucu nbrucu bnrucu rbnucu brnucu urbncu rubncu ubrncu burncu rbuncu bruncu curbnu ucrbnu crubnu rcubnu urcbnu rucbnu cubrnu ucbrnu cburnu bcurnu ubcrnu bucrnu crbunu rcbunu cbrunu bcrunu rbcunu brcunu urbcnu rubcnu ubrcnu burcnu rbucnu brucnu
Note: these 'words' (valid or invalid) are all the permutations of the word uncurb. These words are obtained by scrambling the letters in uncurb.