Spelling differences between American and British English



-or vs. -our
American British
color colour
favorite favourite
honor honour


-ll vs. -l

American British
enrollment enrolment
fulfill fulfil
skillful skilful


-og vs. -ogue

American British
analog analogue
catalog catalogue
dialog dialogue


-ck or -k vs. -que
American British
bank banque
check cheque
checker chequer


-ense vs. -enze
American British
defense defence
license licence


-ze vs. -se

American British
analyze analyse
criticize criticise
memorize memorise


-er vs. -re

American British
center centre
meter metre
theater theatre


-e vs. -oe or -ae

American British
encylopedia encylycopaedia
maneuver manoeuvre
medieval mediaeval


-dg vs. -dge (or -g vs. -gu)

American British
aging ageing
argument arguement
judgment judgement



American British
jewelry jewellery
draft draught
pajamas pyjamas 
plow plough
program programme
tire tyre

In British English, words that end in -l preceded by a vowel usually double the -l when a suffix is added, while in American English the letter is not doubled.  The letter will double in the stress is on the second syllable.
Base Word American British
counsel counseling counselling
equal equaling equalling
model modeling modelling
quarrel  quarreling quarrelling
signal signaling signalling
travel traveling travelling
excel excelling excelling
propel propelling propelling


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