Common words:
* boat
* body
* boil
* bold
* bone
* book
* boom
* born
* both
* box
* boy
Less common words:
* bob
* bode
* bog
* boil
* bomb
* bona fide
* bonanza
* bond
* bonus
* bony
* boo
* booby
* bookish
* boombox
* boost
* booth
* botany
* bow
* bowl
* boxcar
* boycott
* brainstorm
* broccoli
Proper nouns:
* Boeing
* Bolivia
* Bombay
* Boston
* Botswana
Other words:
* boast
* bobble
* bogus
* bolster
* bombard
* bonfire
* bosh
* bossy
* bouquet
* bowel
* bower
* boxer
* brawn
* brawl
* breathless
* brochure
* brown
This is not an exhaustive list, but it gives you a good starting point.