A

acclimate
(verb) (UK usually: acclimatise)
acetaminophen (or Tylenol)
(UK: paracetamol)

addicting
(UK and US: addictive)

airplane
fixed-wing aircraft. Alteration of UK aeroplane, probably influenced by aircraft

alphabetize
(verb) (UK and US: sort alphabetically)

aluminum
(UK: aluminium)

arroyo
a usually dry creek.

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B

baby carriage
pushable vehicle for transporting babies, also called stroller, buggy or regionally baby coach (UK: perambulator (old-fashioned or formal), pram, or, for the type that an older baby sits rather than lies in, pushchair)

backhoe
a piece of excavating equipment (UK usually digger, mechanical digger, excavator, or JCB, genericized trademark)

ballpark
a baseball stadium; a range of approximation or accuracy ("in the ballpark"; "a ballpark figure")

Band-Aid
(trademark) bandage for minor wounds, (UK: Elastoplast (trademark), plaster [DM]); also, a makeshift solution

bangs
front part of the hair cut to hang over the forehead (UK: a fringe)

barrette
hair slide

baseboard
skirting board

bayou
(from Louisiana French) an often marshy slow-moving minor watercourse, usually located in a low-lying area (as in the Mississippi River delta region of the southern United States)

bedroom community
a commuter town or suburb (UK: dormitory town [DM])

Bear claw
A kind of sweet pastry served mainly on the West Coast of the United States.

bell pepper
a mild (not spicy) red or green pepper or capsicum in Australian English and Indian English

beltway
a ring road, or orbital motorway found around or within many cities.

blacktop
a road surface [DM] composed of asphalt concrete; also a verb ("to blacktop a parking lot") (UK: compare tarmac)

boardwalk
a walkway usually made of planking, typically along a beach (as that of Atlantic City)

bobby pin
hair grip, Kirby grip

booger
(slang) a piece of nasal mucus (UK: bogey)

bookmobile
a large vehicle housing a mobile lending library (UK: mobile library)

boombox
a large portable stereo, syn. with ghettoblaster, which is also American in origin but is common in the UK.

boondocks
(also the boonies) rough country; a very rural location or town; backwoods; the "sticks". Sometimes refers to rough, poor neighborhoods in a city. From Tagalog.

boondoggle
slang term for a scheme that wastes time and money; also scoubidou, a knotting and plaiting craft

Botts' dot
see raised pavement marker (UK & US: cat's eye)

brah
from brother (alternative to 'bro'; see bro)

breadbox
a box for keeping bread (UK: usually bread bin)

broil
to cook food with high heat with the heat applied directly to the food from above (UK: grill) [DM]. Apparently first used by Chaucer.

brownstone
a type of residential building found in New York City and other large cities

buddy, bud
a friend; also used as a term of address (UK similar: mate)

bullhorn
a megaphone

burglarize
to carry out a burglary (UK: burgle; burgle is very rare in US, and burglarize virtually nonexistent in UK)

busboy
junior restaurant worker assisting waiting staff, table clearer, water pourer etc. (UK: busser; runner)

busyness
hustle and bustle

butte
an isolated hill with steep sides and a small flat top

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C

caboose
a train car attached usually to the rear mainly for the crew's use (UK: guard's van' or brake van'); also (colloquial) the buttocks

candy apple*, candied apple
toffee apple

canola
a trademarked variety of rapeseed

careen
(of a vehicle) to travel fast and out of control, usually swerving or cornering (UK: career)

carhop
someone serving food at a drive-in, often on rollerskates

catercorner
(or catercornered, catacorner, kitty-corner, catty-corner, etc.) (adverb) diagonally, diagonally opposite ("The house looks catercorner to mine"). Cater Corner is the original form (from the French quatre and English 'corner' = four + corner), but the forms kitty corner and catty corner (folk etymology) are usual in speech, the latter especially in the North and West, while the former in the Midland and South. Sometimes (dialectal, regional) also kitty/catty wampus/wumpus (unclearly derived), which can also mean "awry".

catsup
alternative spelling of ketchup that rarely sees use in the UK.

cell phone
(short for cellular telephone) a portable telephone; UK: mobile phone, often abbreviated to mobile

central air
central air conditioning

ChapStick
(trademark, sometimes used generically) a lip balm - trademark Lypsyl is common (UK: Lip Balm )

checkers
a popular board game (UK: draughts)

charge account
in a store or shop (UK: credit account)

checking account
the type of bank account used for drawing checks; distinguished from savings account. (UK: current account or cheque account)

cilantro
coriander leaf, while in the US, coriander refers only to the seed.

cookout
informal meal cooked and eaten outdoors, a cross between a picnic and a barbecue or a cooking competition taking place outdoors

co-ed, coed
female student at a coeducational college (e.g. "He saw the party as an opportunity to meet co-eds."); any group of people with members from both genders (e.g. "My soccer team is co-ed.")

condo
Condominium

cooties
fictional disease, a term used by children (UK: lurgy); also a term for lice

costume party
party where costumes are worn (UK: fancy-dress party)

cotton candy
spun sugar often sold at fairs (UK: candy floss)

counterclockwise
(UK: anti-clockwise)

coveralls
a one-piece outer protective garment (UK: overall, boiler suit)

critter
(informal) a creature; an animal (as a horse in the South or a bull in the North); often used jocularly (as in "congresscritter", a congressperson); sometimes a term of endearment

crapshoot
risky and uncertain venture; from craps, a dice game