The List
There are 178 6 letter words with Y as the first letter. The highest scoring is YAKUZA at 22 points in Scrabble. 36 carry three or more vowels, which makes them useful for dumping a vowel-clogged rack.
YABBASYABBERYABBIEYACCASYACHTSYACKASYACKEDYACKERYAFFEDYAFFLEYAGERSYAGGERYAHOOSYAIRDSYAKKASYAKKEDYAKKERYAKOWSYAKUZAYAMENSYAMMERYAMUNSYANKEDYANKEEYANKERYANKIEYANQUIYANTRAYAOURTYAPOCKYAPOKSYAPONSYAPPEDYAPPERYAPPIEYAQONAYARCOSYARDEDYARDERYARELYYARESTYARFASYARKEDYARNEDYARNERYARPHAYARRANYARROWYARTASYARTOSYASMAKYATTERYAUPEDYAUPERYAUPONYAUTIAYAWINGYAWLEDYAWNEDYAWNERYAWPEDYAWPERYBLENTYBOUNDYBRENTYCLEPTYEALMSYEANEDYEARDSYEARLYYEARNSYEASTSYEASTYYECCHSYEDINGYEELINYELLEDYELLERYELLOWYELMEDYELPEDYELPERYEMMERYENNEDYENTASYENTESYEOMANYEOMENYERBASYERDEDYERKEDYESKEDYESSEDYESSESYESTERYETTIEYEUKEDYEVINGYEXINGYICKERYIDAKIYIELDSYIKINGYIKKERYINDIEYIPPEDYIPPEEYIPPERYIPPIEYIRDEDYIRKEDYIRREDYIRTHSYITIESYITTENYMPINGYNAMBUYOBBOSYOCKEDYODELSYODLEDYODLERYODLESYOGEESYOGINIYOGINSYOGISMYOGURTYOICKSYOJANAYOJANSYOKELSYOKERSYOKINGYOKKEDYOLKEDYOMPEDYONDERYONKERYONNIEYORKEDYORKERYORKIEYORPEDYOUKEDYOUNGSYOUPONYOURTSYOUTHSYOUTHYYOWIESYOWINGYOWLEDYOWLERYOWLEYYPIGHTYPLASTYRNEHSYSHENDYSHENTYTTRIAYTTRICYUCCASYUCKEDYUCKERYUKATAYUKIERYUKINGYUKKEDYULANSYUMPEDYUMPIEYUNXESYUPONSYUPPIEYURTASYUTZESYWROKE