BI
BIACETYL
BIACETYLS
BIALI
BIALIES
BIALIS
BIALY
BIALYS
BIANNUAL
BIANNUALLY
BIANNUALS
BIANNULATE
BIAS
BIASED
BIASEDLY
BIASES
BIASING
BIASINGS
BIASNESS
BIASNESSES
BIASSED
BIASSEDLY
BIASSES
BIASSING
BIATHLETE
BIATHLETES
BIATHLON
BIATHLONS
BIAURICULAR
BIAURICULATE
BIAXAL
BIAXIAL
BIAXIALLY

33 words start with BIA.