There are a total of 7 4-letter words ending in 'io', and the number may vary in different dictionaries. You can specify the dictionary and order.
There are 7 4-letter words ending in io in the well-known word game dictionary, 5 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 7 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 5 in the Words with Friends (WWF) dictionary.
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