- backfield
- backfile
- backfill
- backfire
- backfist
- backfit
- backflash
- backflip
- backflow
- backgammon
- background
- background extinction
- background music
- background processing
- background projection
- background radiation
- backgrounder
- backhand
- backhanded
- backhander
- backhaul
- backhoe
- backhouse
- backie
- backing
- backing dog
- backing light
- backing store
- backlash
- backless
- backlight
- backlighting
- backlins
- backlist
- backlit
- backlite
- backlog
- backlot
- backmost
- backpack
- backplate
- backpressure
- backrest
- backronym
- backrub
- backrush
- backsaw
- backscatter
- backscratcher
- backseat
- backseat driver
- backset
- backsheesh
- backshore
- backside
- backside-front
- backside-to
- backsight
- backslap
- backslapping
- backslash
- backslide
- backsource
- backspace
- backspin
- backsplash
- backsplice
- backstab
- backstage
- backstairs
- backstay
- backstitch
- backstop
- backstory
- backstrap loom
- backstreet
- backstretch
- backstroke
- backstroker
- backswept
- backswimmer
- backswing
- backsword
- backswordman
- backtrack
- backup
- backup light
- backward
- backward and forward
- backwardation
- backwards
- backwash
- backwater
- backwater valve
- backwind
- backwoods
- backwoodsman
- backword
- backwrap
- backyard
- baclava
- bacne
- bacon
- bacon beetle
- bacon-and-eggs
- baconburger
- baconer
- bact.
- bacteraemia
- bacteremia
- bacteri-
- bacteria
- bacteria bed
- bacterial canker
- bacterial endocarditis
- bacterial infection
- bacterial plaque
- bactericidal
- bactericide
- bacterin
- bacterio-
- bacteriochlorophyll
- bacteriol.
- bacteriological warfare
- bacteriology
- bacteriolysis
- bacteriophage
- bacteriorhodopsin
- bacterioscopy
- bacteriostasis
- bacteriostat
- bacteriostatic
- bacteriotoxin
- bacterium
- bacteriuria
- bacterize
- bacteroid
- bacteroides
- baculiform
- baculine
- baculite
- baculum
- bad
- bad actor
- bad apple
- bad bank
- bad blood
- bad cholesterol
- bad conduct discharge
- bad egg
- bad faith
- bad guy
- bad hair day
- bad luck
- bad man
- bad mouth
- bad name
- bad news
- bad off
- bad paper
- bad place, the
- bad seed
- bad sort, a
- bad taste
- bad time
- bad trip
- bad trot
- bad-mouth
- bad-tempered
- bada-bing
- badass
- baddeleyite
- badder
- badderlocks
- baddest
- baddie
- baddish
- bade
- badge
- badger
- badger game
- badger plane
- badigeon
- badinage
- badinerie
- badlands
- badly
- badly off
- badman
- badmash
- badminton
- bae
- bael
- baetyl
- baff
- baffies
- baffle
- baffled
- bafflegab
- baffleplate
- baffy
- bag
- bag and baggage
- bag holder
- bag holding
- bag it
- bag job
- bag lady
- bag moth
- bag of tricks
- bag of waters
- bag people
- bag table
- bagasse
- bagassosis
- bagatelle
- bagel
- bagful
- baggage
- baggage car
- baggage handler
- baggagemaster
- baggataway
- bagger
- baggies
- bagging
- baggy
- baggy green
- bagh
- bagheera
- baghla
- bagie
- bagless
- bagman
- bagna cauda
- bagnette
- bagnio
- bagpipe
- bagpipes
- bags
- bagswinger
- baguette
- bagwash
- bagwig
- bagwoman
- bagwork
- bagworm
- bah
- bahadur
- baht
- bahu
- bahut
- bahuvrihi
- bai
- baigan choka
- baigneuse
- bail
- bail bond
- bail bondsman
- bail out
- bail up
- bailable
- bailee
- bailey
- bailie
- bailiff
- bailiwick
- bailment
- bailor
- bailout
- bailsman
- bain-marie
- bainite
- baire
- bairn
- bait
- bait and switch
- bait casting
- bait-and-switch
- baitfish
- baith
- baiza
- baize
- baizuo
- bajada
- bake
- bake in
- bake sale
- bakeapple
- baked Alaska
- baked beans
- baked meat
- bakegoods
- bakehouse
- bakemeat
- baker
- baker's dozen
- bakersheet
- bakery
- bakeware