Yes, hallmark is a Scrabble word!
...and is worth 17 points in Scrabble, and 19 points in Words with Friends
hallmark
Noun
1. A distinctive characteristic or attribute
2. A mark on an article of trade to indicate its origin and authenticity
What Scrabble words can I make with the letters in hallmark?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words