Mammoth Uncensored Word List:
33 - 12 letter words starting with ru

rubbernecked rubbernecker rubefacients rubefactions rubrications rudderstocks rudimentally ruefulnesses ruggednesses rumgumptions rumgumptious ruminatingly ruminatively rumormongers rumourmonger ruptureworts ruralisation ruralization russomaniacs russophilics russophilism russophilist russophobiac russophobias russophobics russophobism russophobist rusticalness rusticatings rustications rustproofers rustproofing ruthlessness