Yes, impost is a Scrabble word!
...and is worth 10 points in Scrabble, and 12 points in Words with Friends
impost
Noun
1. Money collected under a tariff
2. The lowest stone in an arch -- from which it springs
What Scrabble words can I make with the letters in impost?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words