There are a total of 97 11-letter words containing 'yo', and the number may vary in different dictionaries. You can specify the dictionary and order.

• actomyosins ₂₀
• aepyornises ₁₇
• alcyonarian ₁₉
• amphictyony ₂₇
• amyotrophic ₂₄
• antibaryons ₁₈
• bayonetting ₂₀
• bryological ₂₃
• bryologists ₁₉
• bryophyllum ₂₉
• caryopsides ₂₀
• conveyorise ₂₁
• conveyorize ₃₀
• cryobiology ₂₄
• cryonically ₂₄
• cryoscopies ₂₂
• cryosurgeon ₂₀
• cryosurgery ₂₁
• cryotherapy ₂₃
• dictyosomes ₂₀
• dictyostele ₁₈
• embryogenic ₂₅
• embryologic ₂₅
• embryonated ₂₁
• embryophyte ₂₆
• hyoscyamine ₂₄
• ichthyolite ₂₁
• ichthyology ₂₅
• ichthyornis ₂₁
• ichthyosaur ₂₁
• karyogamies ₂₂
• karyologies ₂₀
• karyolymphs ₂₈
• karyotyping ₂₅
• lyophilised ₂₁
• lyophilises ₂₀
• lyophilized ₃₀
• lyophilizer ₂₉
• lyophilizes ₂₉
• mayonnaises ₁₈
• mayoralties ₁₇
• meromyosins ₂₀
• myocarditis ₂₀
• myoclonuses ₂₂
• myoelectric ₂₃
• myofilament ₂₄
• myoinositol ₁₈
• plyometrics ₂₃
• polyolefins ₂₂
• polyonymous ₂₄
• presbyopias ₂₂
• presbyopics ₂₅
• procaryotes ₁₉
• prokaryotes ₂₀
• prokaryotic ₂₃
• tropomyosin ₂₀
• yobbishness ₂₂
• yohimbenine ₂₃
• yokefellows ₂₅
• youngnesses ₁₈
• youthquakes ₃₀
• diphyodonts ₂₁
• leiomyomata ₁₈
• nonbaryonic ₁₈
• polyonymies ₂₁
• yoctosecond ₁₉
• youngbloods ₁₈
• amphictyons ₂₃
• brachyodont ₂₂
• caryopteris ₁₈
• cryoconites ₁₈
• cryohydrate ₂₃
• cryometries ₁₈
• cryophysics ₂₆
• dyophysites ₂₃
• dyotheletes ₁₈
• dyotheletic ₂₀
• dyothelisms ₂₀
• dyothelites ₁₈
• dyothelitic ₂₀
• glyoxalines ₂₂
• hyoplastral ₁₉
• hyoplastron ₁₉
• ichthyoidal ₂₃
• ichthyopsid ₂₅
• karyologist ₁₉
• karyoplasms ₂₂
• lyophiliser ₁₉
• lyosorption ₁₆
• matryoshkas ₂₃
• myocardiums ₂₁
• myographies ₂₂
• myographist ₂₂
• presbyopies ₂₀
• procaryotic ₂₀
• rhabdomyoma ₂₄
• synkaryonic ₂₃

There are 97 11-letter words containing yo in the well-known word game dictionary, 59 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 92 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 61 in the Words with Friends (WWF) dictionary.