BOI
BOIL
BOILABLE
BOILED
BOILER
BOILERIES
BOILERMAKER
BOILERMAKERS
BOILERPLATE
BOILERPLATED
BOILERPLATES
BOILERPLATING
BOILERS
BOILERSUIT
BOILERSUITS
BOILERY
BOILING
BOILINGLY
BOILINGS
BOILOFF
BOILOFFS
BOILOVER
BOILOVERS
BOILS
BOING
BOINGED
BOINGING
BOINGS
BOINK
BOINKED
BOINKING
BOINKS
BOIS
BOISERIE
BOISERIES
BOISTEROUS
BOISTEROUSLY
BOISTEROUSNESS
BOITE
BOITES

40 words start with BOI.