- backronym
- back room
- back row
- backrub
- back run
- backrush
- Backs
- backsaw
- back saw
- backscatter
- back scatter
- back score
- backscratcher
- back scratcher
- backseat
- back seat
- backseat driver
- back-seat driver
- backset
- back shaft
- backsheesh
- back shift
- backshore
- backside
- backside-front
- backside-to
- backsight
- back slang
- backslap
- backslapping
- back-slapping
- backslash
- backslide
- backsource
- backspace
- backspin
- backsplash
- backsplice
- backstab
- back-stabbing
- back staff
- backstage
- backstairs
- back stairs
- backstay
- backstitch
- backstop
- backstory
- back story
- back straight
- backstrap loom
- backstreet
- back street
- back-street
- backstretch
- back stretch
- backstroke
- backstroker
- backswept
- backswimmer
- backswing
- backsword
- backswordman
- back talk
- back the wrong horse
- back to back
- back-to-back
- back to basics
- back-to-basics
- back to the drawing board
- back to the salt mines
- back to the wall
- backtrack
- back-trail
- backup
- back up
- backup light
- back-up light
- back vent
- back walkover
- backward
- backward and forward
- backwardation
- backwards
- backwash
- backwater
- back water
- backwater valve
- backwind
- backwoods
- backwoodsman
- backword
- backwrap
- backyard
- back yard
- baclava
- bacne
- Bacolod
- bacon
- Bacon
- Bacon, Francis
- Bacon's Rebellion
- bacon-and-eggs
- bacon beetle
- baconburger
- baconer
- Baconian
- Baconian method
- Baconian theory
- BACS
- bact.
- bacteraemia
- bacteremia
- bacteri-
- bacteria
- Bacteria
- bacteria bed
- bacterial
- bacterial canker
- bacterial endocarditis
- bacterial infection
- bacterial plaque
- bactericidal
- bactericide
- bacterin
- bacterio-
- bacteriochlorophyll
- bacteriol.
- bacteriological warfare
- bacteriologist
- bacteriology
- bacteriolysis
- bacteriophage
- bacteriorhodopsin
- bacterioscopy
- bacteriostasis
- bacteriostat
- bacteriostatic
- bacteriotoxin
- bacterium
- bacteriuria
- bacterize
- bacteroid
- bacteroides
- Bactria
- Bactrian
- Bactrian camel
- baculiform
- baculine
- baculite
- baculum
- bad
- bada-bing
- bad actor
- Badajoz
- Badakhshan
- Badalona
- bad apple
- Badarian
- badass
- Badb
- bad bank
- bad blood
- bad cholesterol
- bad conduct discharge
- baddeleyite
- badder
- badderlocks
- baddest
- baddie
- baddish
- bade
- bad egg
- Baden
- Baden-Baden
- Baden-Powell
- Baden-Württemberg
- Bader
- bad faith
- badge
- badger
- badger game
- badger plane
- Badger State
- Bad Godesberg
- bad guy
- bad hair day
- Bad Homburg
- badigeon
- badinage
- badinerie
- badlands
- Bad Lands
- Badlands National Park
- bad luck
- badly
- badly off
- badman
- bad man
- badmash
- badminton
- Badminton
- bad mouth
- bad-mouth
- bad name
- bad news
- Bad news travels fast
- bad off
- Badoglio
- bad paper
- bad place, the
- Badr
- bad seed
- bad sort, a
- bad taste
- bad-tempered
- bad time
- bad trip
- bad trot
- bae
- BAE
- Baeck
- Baeda
- Baedeker
- Baedeker raid
- Baekeland
- bael
- Baer
- baetyl
- Baeyer
- Baez
- BAF
- Bafana Bafana
- baff
- baffies
- Baffin
- Baffin Bay
- Baffin Island
- baffle
- baffled
- bafflegab
- baffleplate
- baffy
- BAFTA
- bag
- Baganda
- bag and baggage
- bagasse
- bagassosis
- bagatelle
- Bagdad
- Bagehot
- bagel
- bagful
- baggage
- baggage car
- baggage handler
- baggagemaster
- baggataway
- bagger
- Baggie
- baggies
- bagging
- baggy
- baggy green
- bagh
- Baghdad
- bagheera
- baghla
- Bāghlān
- bag holder
- bag holding
- bagie
- bag it
- bag job
- bag lady
- bagless
- Bagley
- bagman
- bag moth
- bagna cauda
- bagnette
- bagnio
- Bagnold
- Bago
- bag of tricks
- bag of waters
- bag people
- bagpipe
- bagpipes
- Bagram
- bags
- bagswinger
- bag table
- baguette
- Baguio
- bagwash
- bagwig
- bagwoman
- bagwork
