Mammoth Uncensored Word List:
99 - 9 letter words starting with y

yabbering yachtings yachtsman yachtsmen yahooisms yahrzeits yakimonos yakitoris yammerers yammering yappingly yardbirds yardlands yardstick yardwands yardworks yarmelkes yarmulkas yarmulkes yarramans yataghans yattering yawmeters yawningly ycleeping yeanlings yearbooks yearlings yearnings yeasayers yeastcake yeastiest yeastless yeastlike yeldrings yeldrocks yelloched yellowest yellowfin yellowier yellowing yellowish yellowism yersiniae yersinias yeshivahs yeshivoth yesterday yestereve yestreens yickering yieldable yieldings yikkering yobberies yobbishly yoctogram yoctovolt yoctowatt yodellers yodelling yoghourts yohimbine yoicksing yokemates yokozunas yoldrings yolkiness yottabits yottabyte yottaflop yottagram yottavolt yottawatt youngling youngness youngster youngthly youthened youthhead youthhood youthiest youthless youthlike youthsome youthwort yravished yshending ytterbias ytterbite ytterbium ytterbous yuckiness yuletides yumminess yuppiedom yuppieish yuppified yuppifies