Yes, guyots is a Scrabble word!
...and is worth 10 points in Scrabble, and 11 points in Words with Friends
guyots
Noun
1. A seamount of volcanic origin (especially in the Pacific Ocean)
What Scrabble words can I make with the letters in guyots?
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Words that can be created with an extra letter added to guyots:
R:yogurts