rivers irvers rviers vriers ivrers virers rievrs irevrs reivrs erivrs iervrs eirvrs rveirs vreirs revirs ervirs verirs evrirs iverrs vierrs ievrrs eivrrs veirrs evirrs rivres irvres rvires vrires ivrres virres rirves irrves rrives rrives irrves rirves rvries vrries rrvies rrvies vrries rvries ivrres virres irvres rivres vrires rvires riervs irervs reirvs erirvs ierrvs eirrvs rirevs irrevs rrievs rrievs irrevs rirevs rerivs errivs rreivs rreivs errivs rerivs ierrvs eirrvs irervs riervs erirvs reirvs rveris vreris revris ervris verris evrris rvreis vrreis rrveis rrveis vrreis rvreis rervis errvis rrevis rrevis errvis rervis verris evrris vreris rveris ervris revris iverrs vierrs ievrrs eivrrs veirrs evirrs ivrers virers irvers rivers vriers rviers iervrs eirvrs irevrs rievrs erivrs reivrs verirs evrirs vreirs rveirs ervirs revirs rivesr irvesr rviesr vriesr ivresr viresr rievsr irevsr reivsr erivsr iervsr eirvsr rveisr vreisr revisr ervisr verisr evrisr iversr viersr ievrsr eivrsr veirsr evirsr rivser irvser rviser vriser ivrser virser risver irsver rsiver sriver isrver sirver rvsier vrsier rsvier srvier vsrier svrier ivsrer visrer isvrer sivrer vsirer svirer riesvr iresvr reisvr erisvr iersvr eirsvr risevr irsevr rsievr srievr isrevr sirevr resivr ersivr rseivr sreivr esrivr serivr iesrvr eisrvr iservr siervr esirvr seirvr rvesir vresir revsir ervsir versir evrsir rvseir vrseir rsveir srveir vsreir svreir resvir ersvir rsevir srevir esrvir servir vesrir evsrir vserir sverir esvrir sevrir ivesrr viesrr ievsrr eivsrr veisrr evisrr ivserr viserr isverr siverr vsierr svierr iesvrr eisvrr isevrr sievrr esivrr seivrr vesirr evsirr vseirr sveirr esvirr sevirr rivrse irvrse rvirse vrirse ivrrse virrse rirvse irrvse rrivse rrivse irrvse rirvse rvrise vrrise rrvise rrvise vrrise rvrise ivrrse virrse irvrse rivrse vrirse rvirse rivsre irvsre rvisre vrisre ivrsre virsre risvre irsvre rsivre srivre isrvre sirvre rvsire vrsire rsvire srvire vsrire svrire ivsrre visrre isvrre sivrre vsirre svirre rirsve irrsve rrisve rrisve irrsve rirsve risrve irsrve rsirve srirve isrrve sirrve rrsive rrsive rsrive srrive rsrive srrive irsrve risrve isrrve sirrve rsirve srirve rvrsie vrrsie rrvsie rrvsie vrrsie rvrsie rvsrie vrsrie rsvrie srvrie vsrrie svrrie rrsvie rrsvie rsrvie srrvie rsrvie srrvie vrsrie rvsrie vsrrie svrrie rsvrie srvrie ivrsre virsre irvsre rivsre vrisre rvisre ivsrre visrre isvrre sivrre vsirre svirre irsvre risvre isrvre sirvre rsivre srivre vrsire rvsire vsrire svrire rsvire srvire riersv irersv reirsv erirsv ierrsv eirrsv riresv irresv rriesv rriesv irresv riresv rerisv errisv rreisv rreisv errisv rerisv ierrsv eirrsv irersv riersv erirsv reirsv riesrv iresrv reisrv erisrv iersrv eirsrv riserv irserv rsierv srierv isrerv sirerv resirv ersirv rseirv sreirv esrirv serirv iesrrv eisrrv iserrv sierrv esirrv seirrv rirsev irrsev rrisev rrisev irrsev rirsev risrev irsrev rsirev srirev isrrev sirrev rrsiev rrsiev rsriev srriev rsriev srriev irsrev risrev isrrev sirrev rsirev srirev rersiv errsiv rresiv rresiv errsiv rersiv resriv ersriv rseriv sreriv esrriv serriv rrseiv rrseiv rsreiv srreiv rsreiv srreiv ersriv resriv esrriv serriv rseriv sreriv iersrv eirsrv iresrv riesrv erisrv reisrv iesrrv eisrrv iserrv sierrv esirrv seirrv irserv riserv isrerv sirerv rsierv srierv ersirv resirv esrirv serirv rseirv sreirv rversi vrersi revrsi ervrsi verrsi evrrsi rvresi vrresi rrvesi rrvesi vrresi rvresi rervsi errvsi rrevsi rrevsi errvsi rervsi verrsi evrrsi vrersi rversi ervrsi revrsi rvesri vresri revsri ervsri versri evrsri rvseri vrseri rsveri srveri vsreri svreri resvri ersvri rsevri srevri esrvri servri vesrri evsrri vserri sverri esvrri sevrri rvrsei vrrsei rrvsei rrvsei vrrsei rvrsei rvsrei vrsrei rsvrei srvrei vsrrei svrrei rrsvei rrsvei rsrvei srrvei rsrvei srrvei vrsrei rvsrei vsrrei svrrei rsvrei srvrei rersvi errsvi rresvi rresvi errsvi rersvi resrvi ersrvi rservi srervi esrrvi serrvi rrsevi rrsevi rsrevi srrevi rsrevi srrevi ersrvi resrvi esrrvi serrvi rservi srervi versri evrsri vresri rvesri ervsri revsri vesrri evsrri vserri sverri esvrri sevrri vrseri rvseri vsreri svreri rsveri srveri ersvri resvri esrvri servri rsevri srevri iversr viersr ievrsr eivrsr veirsr evirsr ivresr viresr irvesr rivesr vriesr rviesr iervsr eirvsr irevsr rievsr erivsr reivsr verisr evrisr vreisr rveisr ervisr revisr ivesrr viesrr ievsrr eivsrr veisrr evisrr ivserr viserr isverr siverr vsierr svierr iesvrr eisvrr isevrr sievrr esivrr seivrr vesirr evsirr vseirr sveirr esvirr sevirr ivrser virser irvser rivser vriser rviser ivsrer visrer isvrer sivrer vsirer svirer irsver risver isrver sirver rsiver sriver vrsier rvsier vsrier svrier rsvier srvier iersvr eirsvr iresvr riesvr erisvr reisvr iesrvr eisrvr iservr siervr esirvr seirvr irsevr risevr isrevr sirevr rsievr srievr ersivr resivr esrivr serivr rseivr sreivr versir evrsir vresir rvesir ervsir revsir vesrir evsrir vserir sverir esvrir sevrir vrseir rvseir vsreir svreir rsveir srveir ersvir resvir esrvir servir rsevir srevir
Note: these 'words' (valid or invalid) are all the permutations of the word rivers. These words are obtained by scrambling the letters in rivers.