Yes, blah is a Scrabble word!
...and is worth 9 points in Scrabble, and 10 points in Words with Friends
blah
Noun
1. Pompous or pretentious talk or writing
What Scrabble words can I make with the letters in blah?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to blah:
S:blahs