There are a total of 48 5-letter words containing 'ku', and the number may vary in different dictionaries. You can specify the dictionary and order.

• ankus ₁₁
• dukun ₁₃
• haiku ₁₂
• hokku ₁₆
• hokum ₁₅
• jukus ₂₀
• kudos ₁₁
• kudus ₁₂
• kudzu ₂₁
• kufis ₁₃
• kugel ₁₃
• kukri ₁₄
• kukus ₁₅
• kulak ₁₅
• kulan ₁₂
• kulfi ₁₄
• kumis ₁₃
• kumys ₁₅
• kunds ₁₂
• kuris ₁₀
• kurta ₁₀
• kurus ₁₁
• kusso ₁₀
• kusti ₁₀
• oakum ₁₃
• onkus ₁₁
• otaku ₁₀
• pukus ₁₄
• rakus ₁₀
• skuas ₁₀
• skulk ₁₅
• skull ₁₂
• skunk ₁₅
• hakus ₁₂
• kokum ₁₅
• kubie ₁₁
• bucku ₁₃
• kuias ₉
• kulas ₉
• kurre ₉
• kutas ₉
• kutch ₁₄
• kutis ₉
• kutus ₉
• kuzus ₁₈
• pikul ₁₁
• skugs ₁₀
• yokul ₁₂

There are 48 5-letter words containing ku in the well-known word game dictionary, 28 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 43 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 33 in the Words with Friends (WWF) dictionary.