There are a total of 15 3-letter words containing 'de', and the number may vary in different dictionaries. You can specify the dictionary and order.

• deb ₇
• dee ₄
• def ₇
• del ₅
• den ₅
• der ₄
• dev ₈
• dew ₇
• dex ₁₁
• dey ₆
• ide ₄
• ode ₄
• dep ₆
• deg ₅
• dei ₄

There are 15 3-letter words containing "de" in the well-known word game dictionary, 11 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 13 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 12 in the Words with Friends (WWF) dictionary.