The List
There are 659 5 letter words with R as the last letter. The highest scoring is WAZIR at 17 points in Scrabble, though Words With Friends prefers JOKER at 18. 37 carry three or more vowels, which makes them useful for dumping a vowel-clogged rack.
ABEARABHORABLERACHARACKERACTORADDERAESIRAFEARAFTERAGGERAIDERAIMERAIRERAIVERALDERALGORALTARALTERAMBERAMEERAMOURANEARANGERANKERANTARAPGARAPTERARBORARDORAREARARMERARMORASKERASPERASTERASTIRATTARAUGERAUGURAURARAWNERBAKERBALERBARERBASERBAZARBEGARBELARBEVERBEVORBIDERBIKERBINERBITERBLAERBLEARBLUERBOLARBORERBOWERBOXERBOYARBREERBRIARBRIERBUYERCABERCAGERCANERCAPERCARERCATERCAVERCEDARCEDERCHAIRCHARRCHEERCHIRRCHOIRCHURRCIDERCIGARCIMARCITERCLEARCLOURCODERCOLORCOMERCOOERCOPERCORERCOVERCOWERCOYERCRIERCRUORCUBERCURERCUTERCYBERCYDERCYMARDAKERDAMARDARERDATERDAZERDEAIRDEBARDEBURDECORDEFERDEMURDENARDETERDEWARDICERDIKERDIMERDINARDINERDIRERDIVERDOLORDONERDONORDOPERDOSERDOTERDOUARDOVERDOWARDOWERDOZERDREARDRIERDRYERDUPEREAGEREASEREATEREDGEREGGAREGGEREIDERELDERELVEREMBAREMBEREMEEREMMERENDERENTEREPHORERRORESCARESKARESKERESTERETHEREYRIRFACERFADERFAKERFAKIRFAQIRFARERFAVERFAVORFAYERFEMURFERERFETORFEUARFEVERFEWERFEYERFIBERFIFERFILARFILERFINERFIRERFIVERFIXERFLAIRFLEERFLIERFLOORFLOURFLUORFLURRFLYERFOUERFOYERFREERFRIARFRIERFRYERFUBARFUMERFURORGAGERGAMERGAPERGATERGATORGAYERGAZARGAZERGEBURGEYERGIBERGIVERGLAIRGLAURGLUERGNARRGOBARGOFERGOIERGOMERGONERGULARHALERHATERHAVERHAYERHAZERHEDERHEPARHEWERHEXERHIDERHIKERHILARHIRERHIVERHOMERHONERHONORHOPERHOSERHOVERHUGERHUMORHYPERICHORICIERICKERIDLERIFTARILLERIMBARINCURINFERINKERINNERINTERINVARITHERJAGERJAGIRJAPERJIBERJIVERJOKERJOWARJUMARJURORKABARKAFIRKEBARKEFIRKESARKITERKNAURKNURRKOKERLABORLACERLADERLAGERLAHARLAKERLAMERLASERLATERLAVERLAWERLAXERLAYERLAZARLEEARLEGERLEMURLEPERLEVERLIBERLIDARLIFERLIGERLIKERLINERLITERLIVERLIVORLOBARLONERLOPERLOSERLOVERLOWERLUGERLUNARLURERLUSERLUTERMACERMAJORMAKARMAKERMALARMANORMARORMASERMATERMAYORMAZERMERERMETERMHORRMILERMILORMIMERMINARMINERMINORMISERMITERMIXERMODERMOHURMOLARMONERMOPERMOTORMOVERMOWERMUCORMUDIRMUSARMUSERMUTERMYLARNADIRNAGORNAKERNAMERNAVARNAZIRNEPERNEVERNEWERNICERNIDORNIGERNITERNIXERNOSERNOTERNUDEROAKEROATEROCCUROCHEROCKERODDERODOUROFFEROFTEROGLEROILEROLDEROLLEROMBERONCEROPTERORDERORMEROSCAROSIEROTHEROTTAROTTEROUTEROWLEROWNEROXTERPACERPAGERPALERPAPERPARERPATERPAVERPAWERPAYERPAYORPETARPETERPHEERPIKERPILARPILERPIPERPLIERPLYERPOKERPOLARPOLERPORERPOSERPOWERPRIERPRIORPRYERPUCERPUDORPUKERPULERPURERQUAIRQUEERRACERRADARRAGERRAKERRARERRASERRATERRAVERRAWERRAZERRAZORREBARRECURREFERREGARREGURRICERRIDERRIFERRIGORRIMERRIPERRISERRIVERROGERROKERROPERROTORROVERROWERRUDERRULERRUMORRYPERSABERSABIRSAFERSAGERSAKERSANERSAPORSASERSATYRSAVERSAVORSAWERSAYERSCAURSCOURSEDERSEFERSEGARSENORSERERSEVERSEWARSEWERSEXERSHEARSHEERSHIERSHIRRSHIURSHOERSHYERSIDERSIEURSIKERSILERSIMARSITARSIVERSIXERSIZARSIZERSKEARSKEERSKIERSKIRRSKYERSLEERSLIERSLYERSMEARSMIRRSMOORSNEERSOBERSOFARSOGERSOHURSOLARSOLERSONARSOPORSORERSOWARSOWERSPAERSPEARSPEERSPEIRSPIERSPOORSPUERSTAIRSTARRSTEARSTEERSTOORSTOURSUBERSUDORSUGARSUHURSUPERSURERSUTORSWEARSWEERSWEIRSYKERSYMARSYVERTABERTABORTAKERTALARTALERTAMERTAPERTAPIRTASARTASERTATARTATERTAVERTAWERTAXERTAXORTENORTHEIRTIGERTILERTIMERTITERTOKERTOLARTONERTOPERTOTERTOWERTOYERTRIERTRIORTRUERTRYERTUBARTUBERTUMORTUNERTUTORTUYERTWEERTWIERTWOERTWYERTYLERUDDERULCERULNARUMBERUNBARUNDERUPPERUPTERURGERUSHERUTTERVALORVAPORVELARVEXERVEZIRVICARVIGORVILERVINERVIPERVISORVIVERVIZIRVIZORVOLARVOMERVOTERVOWERWADERWAFERWAGERWAKERWALERWATERWAVERWAXERWAZIRWEBERWHAURWHEARWHIRRWIDERWIPERWIRERWISERWIVERWOOERWRIERWRYERYAGERYARERYOKERZONER