Yes, cognomen is a Scrabble word!
...and is worth 13 points in Scrabble, and 18 points in Words with Friends
cognomen
Noun
1. A familiar name for a person (often a shortened version of a person's given name)
2. The name used to identify the members of a family (as distinguished from each member's given name)
What Scrabble words can I make with the letters in cognomen?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words