Yes, selfish is a Scrabble word!
...and is worth 13 points in Scrabble, and 13 points in Words with Friends
selfish
Adjective
1. Concerned chiefly or only with yourself and your advantage to the exclusion of others
What Scrabble words can I make with the letters in selfish?
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1 Anagram of Selfish
Words that can be created with an extra letter added to selfish:
S:fishless