- blue
- blue baby
- blue channel
- blue cheese
- blue chip
- blue jeans
- blue moon
- blue tit
- blue whale
- bluebell
- blueberry
- bluebird
- blue-black
- blue-blooded
- bluebottle
- blue-collar
- blue-eyed boy
- blueprint
- bluestocking
- bluff
- blunder
- blundering
- blunt
- bluntly
- bluntness
- blur
- blurb
- blurred
- blurt
- blush
- blusher
- bluster
- blustery
- Blvd
- BM
- BMA
- BMJ
- BMus
- BNP
- BO
- boa constrictor
- boar
- board
- board game
- board meeting
- Board of Trade
- boarder
- boarding card
- boarding house
- boarding school
- boardroom
- boardwalk
- boast
- boastful
- boasting
- boat
- boat people
- boat train
- boater
- boating
- boatswain
- bob
- bobbin
- bobble
- bobby
- bobby pin
- bobby socks
- bobsleigh
- bode
- bodice
- bodily
- body
- body bag
- body building
- body odour
- body search
- body shop
- body stocking
- body suit
- bodyguard
- bodywork
- boffin
- bog
- bogey
- bogeyman
- bogged down
- boggle
- boggy
- bogie
- Bogotá
- bog-standard
- bogus
- Bohemia
- bohemian
- boil
- boiled
- boiler
- boiler suit
- boiling
- boiling point
- boisterous
- bold
- boldly
- Bolivia
- Bolivian
- bollard
- bollocks
- Bolshevik
- bolster
- bolt
- bomb
- bomb disposal squad
- bombard
- bombardment
- bombastic
- bomber
- bomber jacket
- bombing
- bombproof
- bombshell
- bombsite
- bona fide
- bonanza
- bond
- bondage
- bonded warehouse
- bone
- bone china
- bone marrow
- bone-dry
- bone-idle
- boneless
- bonfire
- bonfire night
- bongo
- bonk
- Bonn
- bonnet
- bonny
- bonus
- bonus issue
- bony
- boo
- boob
- boob tube
- booby prize
- booby trap
- boogie
- book
- book bag
- book club
- book token
- bookable
- bookbinding
- bookcase
- bookend
- bookie
- booking
- booking clerk
- booking office
- bookish
- bookkeeper
- bookkeeping
- booklet
- bookmaker
- bookmark
- booksack
- bookseller
- bookshelf
- bookshop
- bookstall
- bookworm
- boom
- boomerang
- boon
- boor
- boorish
- boost
- booster
- booster seat
- boot
- booth
- bootleg
- bootlegger
- booty
- booze
- boozer
- bop
- border
- border collie
- borderline
- Borders
- bore
- bored
- boredom
- boring
- born
- born-again
- borne
- Borneo