The word "biannually" uses 10 letters: aabillnnuy.
biannually is a valid word in this word list. For a definition, see the external dictionary links below.
Try a search for biannually in these online resources (some words may not be found):
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Shorter words found within biannually
aa aal ab aba ai ail ain al ala alan alb alba all an ana anal ani anil ba baa baal bail bal ball ban banal bani bi bill bin binal blain blin ill in la lab labia labial lain lanai li liana lib lin na nab nail nib nil nill