The word "bast" uses 4 letters: A B S T.
Words formed by adding one letter before or after bast (in bold), or to abst in any order:
e - abets baste bates beast beats betas tabes h - bahts baths i - baits l - blast blats o - boast boats botas sabot r - brats s - basts stabs t - batts u - abuts tabus tsuba tubas
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All words formed from bast by changing one letter
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