The answer is Raccoon
Here are some possible words:racierrackerrafterraiderrailerraiserrammerrancorrangerrankerranterrapierrapperrapterraptorrasherrasperrasterratherratterreaderrealerreamerreaperrearerreaverrectorredderreeferreekerreelerregearrehearrenderrenoirrenterrepairresterrevoirrhymerribberricherridderriflerriggerrigourrimierrimmerringerrinserrioterripperriskerroaderroamerroarerrobberrockerrodderrollerromperrooferroomerrooterropierrosierrosterrotterrouserrouterrubberrubierrudderruggerruinerrummerrumourrunnerrusher . racerradarradiatorrafterrancherrancorratherrazorreaderreaperreappearrearreceiverrecorderrecoverregisterregularregulatorreindeerrelieverremainderrememberreminderremoverrenterreoccurrepairreporterresistorresponderretailerretainerretrieverrevolverriderrigorringerriserriverroarrobberrockerrollerrooferroosterrosterrubberruler
Neither.
tenderizer
riot
Words beginning with M and ending with R:MajorManagerMannerManorMarkerMarMasterMatadorMatterMayorMentorMergerMessengerMeterMeteorMinerMinisterMinorMiserMisterMixerModularMolarMonsterMotherMoverMowerMufflerMusterMutter
* daughter
resin rosin ricin
Recap or remap.
errite
killer, kilter, kisser
Words that begin with D and end with R:daggerdangerdaughterDeardeerdeliverdemurderringerdespairdeterdiaperdickerdinerdinnerdirectordisappeardisasterdishwasherdisorderdistributordiverdoctordollardormerdoordrawerdredgerdropperdroverdryerdrummerdumberduster