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English and American English Spelling

Here are the principal differences in spelling between English and American English.

EnglishAmerican English

Final -l is always doubled after one vowel in stressed and unstressed syllables in English but usually only in stressed syllables in American English, for example:

rebel > rebelled
travel > travelled

rebel > rebelled
travel > traveled

Some words end in -tre in English and -ter in American English, for example:

centre
theatre

center
theater

Some words end in -ogue in English and -og in American English, for example:

analogue
catalogue

analog
catalog

Some words end in -our in English and -or in American English, for example:

colour
labour

color
labor

Some verbs end in -ize or -ise in English but only in -ize in American English, for example:

realise, realize
harmonise, harmonize

realize
harmonize

Common Differences

EnglishAmerican English
all rightall right, alright (disputed)
analyseanalyze
centrecenter
chequecheck
colourcolor
counsellorcounselor
criticise, criticizecriticize
defencedefense
doughnutdonut
favourfavor
fibrefiber
flavourflavor
fulfilfulfill
greygray
honourhonor
humourhumor
jewelleryjewellery, jewelry
judgement, judgmentjudgment
kerbcurb
labourlabor
license, licence (verb)
licence (noun)
license (verb)
license (noun)
litreliter
metremeter
mouldmold
neighbourneighbor
offenceoffense
practise (verb)
practice (noun)
practice (verb)
practice (noun)
pretencepretense
programme (plan, concert etc)
program (computer software)
program
program
pyjamaspajamas
realise, realizerealize
savoursavor
specialityspecialty
theatretheater
travelled
travelling
travelled, traveled
travelling, traveling
tyretire
valourvalor

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