| US Spelling | British Spelling | % Correct |
|---|---|---|
| Gray | Grey | 95%
|
| Color | Colour | 93%
|
| Analyze | Analyse | 89%
|
| Aluminum | Aluminium | 88%
|
| Likable | Likeable | 88%
|
| Airplane | Aeroplane | 87%
|
| Aging | Ageing | 84%
|
| Center | Centre | 84%
|
| Realize | Realise | 84%
|
| Defense | Defence | 83%
|
| Mold | Mould | 83%
|
| Chili | Chilli | 82%
|
| Meter | Metre | 82%
|
| Tire | Tyre | 79%
|
| Mustache | Moustache | 77%
|
| Check | Cheque | 76%
|
| Traveler | Traveller | 75%
|
| Catalog | Catalogue | 74%
|
| Program | Programme | 73%
|
| Plow | Plough | 70%
|
| Pajamas | Pyjamas | 62%
|
| Story | Storey | 54%
|
| Racket | Racquet | 51%
|
| Estrogen | Oestrogen | 41%
|
| Curb | Kerb | 40%
|
| Pediatric | Paediatric | 40%
|
| Tidbit | Titbit | 36%
|
| Eon | Aeon | 34%
|
| Behoove | Behove | 29%
|
| Maneuver | Manoeuvre | 26%
|