Preferred terms and what to avoid. Covers inclusive language, American English spelling, and plain language choices.

✗ Not this	✓ Use this
approximately	about
middle-aged	adult
afterwards	afterward
whitelist	allowlist
analyse	analyze
backwards	backward
behaviour	behavior
blacklist	blocklist
purchase (in buttons)	buy
cancelled	canceled
catalogue	catalog
centre	center
kid	child
colour	color
defence	defense
cakewalk	easy, a breeze
terminate	end
sufficient	enough
favourite	favorite
forwards	forward
fulfil	fulfill
assist	help
no can do	it's not possible
aging	mature, older
underaged	minor
master	primary, superior
re-generate	regenerate
slave	secondary, follower
old, elderly	senior, older adult
commence	start, begin
youngster	teen, teenager
she or he	they
towards	toward
utilize	use
re-run	rerun
specify	enter
press	click
respond	reply
read more	learn more
open	go to
error	issue
proceed	continue, next step
choose	select