There are a total of 150 11-letter words starting with 'si', and the number may vary in different dictionaries. You can specify the dictionary and order.

There are 150 11-letter words starting with "si" in the well-known word game dictionary, 71 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 129 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 99 in the Words with Friends (WWF) dictionary.

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