List of British English and American English words

British	American
our ending change to or
Armour	Armor
Armoury	Armory
Behaviour	Behaviour
Candour	Candor
Clamour	Clamor
Colour	Color
Demeanour	Demeanor
Endeavour	Endeavor
Favourite	Favorite
Flavour	Flavour
Glamour	Glamor
Harbour	Harbor
Honour	Honor
Humour	Humor
Labour	Labor
Neighbour	Neighbor
Odour	Odor
Rancour	Rancor
Rigour	Rigor
Rumour	Rumor
Saviour	Savior
Savour	Savor
Savoury	Savory
Splendour	Splendour
Valour	Valor
Vaour	Vapor
Vigour	Vigor
re endings change to er
These words are with -re in both Britain and the US: acre, massacre, mediocre, ogre
Amphitheatre	Amphitheater
Calibre	Caliber
Centimetre	Centimetre
Centre	Center
Fibre	Fiber
Kilometre	Kilometre
Litre	Liter
Louvre	Louver
Lustre	Luster
Manoeuvre	Maneuver
Meagre	Eager
Metre	Meter
Millimetre	Milimeter
Sabre	Saber
Sceptre	Sceptre
Sombre	Somber
Spectre	Spectre
Theatre	Theater
ogue endings change to og Note: ogue can also be used in the US
Analogue	Analog
Dialogue	Dialog
Catalogue	Catalog
Epilogue	Epilog
Monologue	Monolog
prologue	Prolog
Travelogue	Travelog
l endings do not double in US spellings
Cancelled	Canceled
Counsellor	Counselor
Equalled	Equaled
Fuelling	Fueling
Fuelled	Fueled
Grovelling	Groveling
Jeweller	Jeweler
Jewellery	Jewelry or jewellery
Levelled	Leveled
Libelled	Libeled
Marvellous	Marvelous
Modelling	Modeling
Panelled	Paneled
Quarrelling	Quarreling
Revelled	Reveled
Woollen	Woolen
ae and oe words change to e
Diarrhoea	Diarrhea
Oestrogen	Estrogen
Foetus	Fetus
Manoeuvre	Maneuver
Mementoes	Mementos
Anaemia	Anemia
Caesarean	Cesarean
Gynaecology	Gynecology
Haemorrhage	Hemorrhage
Leukaemia	Leukemia
Palaeontology	Paleontology
Paediatric	Pediatric
ise endings change to ize
Some words are the same in both the countries: size, capsize, prize, seize, advise, advertise, surprise
Appetiser	Appetizer
Authorise	Authorize
Capitalise	Capitalize
Characterise	Characterize
Civilise	Civilize
Colonise	Colonize
Criticise	Criticize
Dramatise	Dramatize
Emphasise	Emphasize
Equalise	Equalize
Mobilise	Mobilize
Naturalise	Naturalize
Organise	Organize
Popularise	Popularize
Realise	Realize
Recognise	Recognize
Satirise	Satirize
Standardise	Standardize
Symbolise	Symbolize
Vapourise	Vaporize
Analyse	Analyse
Paralyse	Paralyze
ce and se words
Defence	Defense
Offence	Offense
Pretence	Pretense
Vice (workbench tool)	Vise
Licence (as a noun) License (as a verb)	License (as a noun and as a verb)
Practice (as a noun) Practise (as a verb)	Practice (as a noun and a verb)
Spelling change
Sulphate	Sulfate
Sulphide	Sulphide
Sulphur	Sulfur
Draught	Draft
Plough	Plow
Tyre (on a wheel)	Tire
Gybe	Jibe
Mould	Mold
Moult	Molt
Smoulder	Smolder
Programme	Program
Cheque	Check
Chequer	Checker
Acknowledgement	Acknowledgment
Ageing	Aging
Judgement	Judgment
Aluminium	Aluminum
Axe	Ax
Cosy	Cozy
Kerb (edge of road)	Curb
Furore	Furor
Grey	Gray
Carat	Karat
Liquorice	Licorice
Moustache	Mustache
Nought	Naught
Pyjamas	Pajamas
Sceptic	Skeptic
Phial	Vial
Whisky	Whiskey