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| The differences between US English, UK English and Australian spellings - Common Patterns & Examples | ||
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As the table below shows, the difference between UK and US spelling usually relates to just one or two letters.
| US | UK | Australia | 
|---|---|---|
| uses -ize, -yze (e.g., realize, analyze) | prefers -ise, -yse (e.g., realise, analyse), but is flexible | almost always uses ise, yse | 
| -er (e.g., theater, meter) | -re (e.g., theatre, metre) | British usage | 
| uses -or (e.g., honor, color, splendor) | uses -our (e.g. honour, colour, splendour) | British usage | 
| uses –ction (e.g., connection) | acceptable to use –xion (e.g., connexion), but this is increasingly rare | American usage | 
| often drops -e for word modifications (e.g., judge to judgment, live to livable) | generally keeps –e for word modifications (e.g., judge to judgement, live to liveable) | keeps -e (e.g., judgement), like British; but sometimes drops -e (e.g., livable) | 
| usually prefers -e to -oe or -ae (e.g., pediatrician, leukemia) | uses -oe and -ae (e.g., paediatrician, leukaemia) | British usage | 
| usually prefers one “l” to double “ll” (e.g., canceled, traveled) | uses double “ll” instead of one “l” “(e.g., cancelled, travelled) | British usage (travelling vs traveling, cancelled vs canceled) | 
The following cheat sheet outlines the preferred spelling of some words that are commonly used in academic writing.
Verbs
| US | UK | Australia | 
|---|---|---|
| analyze | analyse | analyse | 
| apologize | apologise | apologise | 
| capitalize | capitalise | capitalise | 
| categorize | categorise | categorise | 
| characterize | characterise | characterise | 
| colonize | colonise | colonise | 
| endeavor | endeavour | endeavour | 
| enroll | enrol | enrol | 
| fulfill | fulfil | fulfil | 
| globalize | globalise | globalise | 
| honor | honour | honour | 
| hypothesize | hypothesise | hypothesise | 
| inquire | enquire | enquire | 
| install | instal | install | 
| legalize | legalise | legalise | 
| maneuver | manoeuvre | manoeuvre | 
| maximize | maximise | maximise | 
| minimize | minimise | minimise | 
| mold | mould | mould | 
| neutralize | neutralise | neutralise | 
| optimize | optimise | optimise | 
| paralyze | paralyse | paralyse | 
| plow | plough | plough | 
| privatize | privatise | privatise | 
| randomize | randomise | randomise | 
| realize | realise | realise | 
| recognize | recognise | recognise | 
Past-tense verbs
| US | UK | Australia | 
|---|---|---|
| canceled | cancelled | cancelled | 
| channeled | channelled | channelled | 
| labeled | labelled | labelled | 
| modeled | modelled | modelled | 
| traveled | travelled | travelled | 
Nouns
| US | UK | Australia | 
|---|---|---|
| acknowledgment | acknowledgement | acknowledgment or acknowledgement | 
| aluminum | aluminium | aluminium | 
| artifact | artefact | artefact | 
| behaviour | behaviour | |
| caliber | calibre | calibre | 
| center | centre | centre | 
| color | colour | colour | 
| cooperation | co-operation | cooperation or co-operation | 
| councilor | councillor | councillor | 
| counselor | counsellor | counsellor | 
| defense | defence | defence | 
| estrogen | oestrogen | oestrogen | 
| fetus | foetus | foetus | 
| fiber | fibre | fibre | 
| flavor | flavour | flavour | 
| humor | humour | humour | 
| judgment | judgement | judgement | 
| labor | labour | labour | 
| leukemia | leukaemia | leukaemia | 
| license | licence | licence | 
| liter | litre | litre | 
| meter | metre | metre | 
| neighbor | neighbour | neighbour | 
| organization | organisation | organisation | 
| paleontology | palaeontology | palaeontology | 
| program | programme (but program if computer-related) | program | 
| sulfur | sulphur | sulphur | 
| theater | theatre | theatre | 
| tire | tyre | tyre | 
| vapor | vapour | vapour | 
Adjectives
| US | UK | Australia | 
|---|---|---|
| aging | ageing | ageing | 
| favorite | favourite | favourite | 
| gray | grey | grey | 
| livable | liveable | livable | 
| movable | moveable | moveable | 
| orthopedic | orthopaedic | orthopaedic | 
| salable | saleable | saleable | 
| skeptical | sceptical | sceptical | 
| somber | sombre | sombre |