There are a total of 101 11-letter words containing 'rial', and the number may vary in different dictionaries. You can specify the dictionary and order.

• accessorial ₁₈
• actuarially ₁₉
• adversarial ₁₇
• advertorial ₁₇
• arterialise ₁₂
• arterialize ₂₁
• bacterially ₂₁
• biomaterial ₁₈
• dictatorial ₁₆
• diphtherial ₂₀
• directorial ₁₆
• editorially ₁₆
• endometrial ₁₇
• equilibrial ₂₆
• etherialise ₁₄
• etheriality ₁₆
• etherialize ₂₃
• eubacterial ₁₉
• executorial ₂₃
• factorially ₂₁
• imperialise ₁₈
• imperialism ₂₁
• imperialist ₁₈
• imperialize ₂₇
• industrials ₁₅
• inventorial ₁₈
• magisterial ₁₇
• manorialism ₁₉
• materialise ₁₅
• materialism ₁₈
• materialist ₁₅
• materiality ₁₇
• materialize ₂₄
• memorialise ₁₈
• memorialist ₁₈
• memorialize ₂₇
• mercurially ₂₂
• ministerial ₁₆
• narratorial ₁₃
• nonmaterial ₁₇
• perineurial ₁₇
• pictorially ₂₁
• piscatorial ₁₈
• purgatorial ₁₈
• quaestorial ₂₂
• raptorially ₁₈
• reportorial ₁₅
• saltatorial ₁₃
• sartorially ₁₅
• scriptorial ₁₈
• secretarial ₁₅
• seigneurial ₁₆
• seigniorial ₁₅
• sensorially ₁₆
• serialising ₁₅
• serializing ₂₄
• subaerially ₁₉
• suctorially ₁₉
• terrestrial ₁₂
• territorial ₁₂
• tonsorially ₁₆
• trimestrial ₁₅
• undertrials ₁₅
• vectorially ₂₂
• serialities ₁₁
• aerialities ₁₁
• amatorially ₁₆
• ancestorial ₁₃
• assessorial ₁₁
• clamatorial ₁₅
• colleterial ₁₃
• crematorial ₁₅
• curialistic ₁₅
• epigastrial ₁₄
• equatorials ₂₀
• escritorial ₁₃
• gestatorial ₁₂
• imperiality ₁₈
• insessorial ₁₁
• institorial ₁₁
• mediatorial ₁₄
• mesenterial ₁₃
• monasterial ₁₃
• multiserial ₁₃
• patrialised ₁₄
• patrialises ₁₃
• patrialisms ₁₅
• patrialized ₂₃
• patrializes ₂₂
• pluriserial ₁₃
• polyzoarial ₂₅
• prefatorial ₁₆
• raptatorial ₁₃
• rectiserial ₁₃
• redactorial ₁₄
• repertorial ₁₃
• selectorial ₁₃
• septentrial ₁₃
• servitorial ₁₄
• spinsterial ₁₃
• uniserially ₁₄

There are 101 11-letter words containing rial in the well-known word game dictionary, 46 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 91 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 64 in the Words with Friends (WWF) dictionary.