English & American English Spelling Here are the principal differences in spelling between English & American English. | English | American 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
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