Everyone has his or her stumbling blocks when it comes to writing and proofreading. Mine are compound words. If I'm going to overlook something in my editing, it's going to be the two words that should be one. Here's the ABC of them to start with.
afterbirth
afterburner
aftermath
airbrush
aircraft
airfield
airliner
airman
airport
airship
armchair
armpit
arrowhead
authorship
backbite
backdrop
backfield
backfire
background
backhand
backlash
backlog
backside
backslide
backspin
backstop
backstretch
backstroke
backtrack
backward
backwash
backwater
backwoods
bagpipe
ballroom
bandwagon
bankbook
bankroll
barnstorm
barnyard
barroom
bartender
baseball
baseboard
bathroom
beachcomber
beachhead
bedridden
bedrock
bedroll
bedspread
bedtime
beeline
bellhop
billboard
billfold
blacklist
blackmail
blacktop
blockbuster
bloodsucker
bobcat
bobtail
bookmobile
boxcar
brainstorm
brainwash
breakfast
brickbat
bridgehead
briefcase
broadcast
brotherhood
buckshot
buckskin
bucktooth
bugbear
bulldog
bulldozer
bullfrog
bullheaded
bullpen
buttercup
butterfingers
butterfly
buttermilk
capsize
carhop
carport
catbird
catfish
catnip
cattail
chairman
championship
cheapskate
checkmate
checkroom
checkup
cheesecloth
chestnut
chickpea
chickweed
chopstick
citizenship
clapboard
claptrap
clockwise
clockwork
clodhopper
clotheshorse
cobweb
copycat
copyreader
copyright
copywriter
corkscrew
cornerstone
cornstalk
cornwall
cottonmouth
cottontail
cottonwood
countdown
counterattack
counterbalance
counterclockwise
counterintelligence
countermeasure
counteroffensive
counterpane
counterpart
counterpoint
counterpoise
counterrevolution
countersign
countersink
countertenor
counterweight
courthouse
courtship
courtyard
cowbird
cowboy
cowcatcher
cowhide
cowlick
cowpoke
cowpox
cowpuncher
cowslip
crabgrass
crackdown
crackerjack
crackpot
crackup
cradlesong
crankcase
crankshaft
crapshooter
crawfish
crestfallen
crossbar
crossbeam
crossbones
crossbow
crossbreed
crosscurrent
crosscut
crosspiece
crossroad
crosstalk
crosswalk
crosswise
crowbar
crybaby
cubbyhole
cupboard
cupcake
cutback
cutlass
cutlet
cutoff
cutthroat
cutup
I'll post a few more next week!