There are a total of 137 9-letter words containing 'oy', and the number may vary in different dictionaries. You can specify the dictionary and order.

• annoyance ₁₇
• annoyedly ₁₇
• aroynting ₁₅
• beachboys ₂₂
• blackboys ₂₅
• boyarisms ₁₇
• boychicks ₂₆
• boycotted ₁₈
• boycotter ₁₇
• boyfriend ₁₉
• bullyboys ₂₂
• buoyances ₁₉
• buoyantly ₁₉
• chatoyant ₁₇
• cherimoya ₁₉
• chirimoya ₁₉
• choirboys ₁₉
• cloyingly ₂₁
• coemploys ₂₁
• convoying ₂₂
• corduroys ₁₆
• cowboying ₂₃
• coynesses ₁₅
• coyotillo ₁₆
• deploying ₁₉
• destroyed ₁₃
• destroyer ₁₂
• doughboys ₂₀
• employees ₁₈
• employers ₁₈
• employing ₂₁
• enjoyable ₂₅
• enjoyably ₂₇
• enjoyment ₂₅
• gargoyled ₁₇
• gargoyles ₁₆
• houseboys ₁₇
• hoydening ₁₈
• hoydenish ₁₇
• joyfuller ₂₆
• joylessly ₂₄
• joypopped ₃₀
• joypopper ₂₉
• joyridden ₂₃
• joyriders ₂₁
• joyriding ₂₄
• joysticks ₂₇
• lifebuoys ₁₉
• loyalisms ₁₆
• loyalists ₁₃
• loyalties ₁₃
• maccaboys ₂₃
• maccoboys ₂₃
• misemploy ₂₁
• overjoyed ₂₅
• oysterers ₁₁
• oystering ₁₄
• oysterman ₁₅
• oystermen ₁₅
• paduasoys ₁₆
• paperboys ₂₀
• permalloy ₁₉
• prettyboy ₁₉
• redeploys ₁₆
• reemploys ₁₈
• reenjoyed ₂₂
• royalisms ₁₅
• royalists ₁₂
• royalties ₁₂
• roystered ₁₂
• schoolboy ₂₀
• shamoying ₁₉
• sonobuoys ₁₆
• soyabeans ₁₅
• stableboy ₁₈
• surroyals ₁₃
• tannoying ₁₆
• titihoyas ₁₃
• tomboyish ₁₉
• toymakers ₁₈
• tutoyered ₁₃
• unalloyed ₁₆
• uncloying ₂₀
• unroyally ₁₇
• viceroyal ₁₉
• voyageurs ₁₈
• voyeurism ₁₉
• zircalloy ₂₅
• antiroyal ₁₂
• bellbuoys ₁₆
• carbamoyl ₁₈
• choreboys ₁₉
• deployers ₁₅
• disemploy ₁₇
• royalmast ₁₄
• soyburger ₁₅
• tinkertoy ₁₆
• unannoyed ₁₃
• unenjoyed ₂₀
• voyagings ₁₇
• zircaloys ₂₃
• accloying ₁₇
• billyboys ₁₉
• canticoys ₁₆
• cloyments ₁₆
• coystrels ₁₄
• coystrils ₁₄
• dalmahoys ₁₈
• diddicoys ₁₇
• envoyship ₂₀
• esloyning ₁₃
• ethanoyls ₁₅
• gurgoyles ₁₄
• hoydenism ₁₈
• kantikoys ₂₀
• loyallest ₁₂
• loyalness ₁₂
• moygashel ₁₈
• overcloys ₁₇
• oystriges ₁₃
• pennyboys ₁₉
• ploughboy ₂₀
• popjoying ₂₄
• poysoning ₁₅
• recoyling ₁₅
• requoyled ₂₂
• requoyles ₂₁
• royalised ₁₃
• royalises ₁₂
• royalized ₂₂
• royalizes ₂₁
• royallest ₁₂
• roysterer ₁₂
• savoyards ₁₆
• smallboys ₁₆
• streetboy ₁₄
• toylesome ₁₄

There are 137 9-letter words containing oy in the well-known word game dictionary, 92 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 127 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 88 in the Words with Friends (WWF) dictionary.