Yes, penguin is a Scrabble word!
...and is worth 10 points in Scrabble, and 15 points in Words with Friends
penguin
Noun
1. Short-legged flightless birds of cold southern especially Antarctic regions having webbed feet and wings modified as flippers
What Scrabble words can I make with the letters in penguin?
5 Letter Words
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3 Letter Words
2 Letter Words