There are a total of 10 4-letter words containing 'xi', and the number may vary in different dictionaries. You can specify the dictionary and order.

• axil ₁₂
• axis ₁₁
• exit ₁₁
• ixia ₁₁
• maxi ₁₄
• oxic ₁₄
• oxid ₁₂
• oxim ₁₄
• taxi ₁₁
• dixi ₁₂

There are 10 4-letter words containing xi in the well-known word game dictionary, 9 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 9 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 9 in the Words with Friends (WWF) dictionary.