SPELLING
A number of words end in –or in American English and –our in British English (e.g. color/colour). Some words end in –er in American English and –re in British English (e.g. center/centre). Many verbs which end in –ize in American English (e.g.realize) can be spelt in British English with –ize or –ise. Some of the commonest words with different forms are:
American English, (British English)
aluminum, (aluminium)
analyze, (analyse)
catalog(ue), (catalogue)
center, (centre)
check, (cheque)
color, (colour)
defense, (defence)
honor, (honour)
jewelry, (jewellery)
labor, (labour)
pajamas, (pyjamas)
paralyze,(paralyse)
program, (programme)
realize, (realize/realize)
theater, (theatre)
tire, (tyre)
whiskey, ((scotch)whisky)