Basic Guidelines For English Spellings
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British English words that end in -re often end in -er in American English:
British | US |
centre | center |
fibre | fiber |
litre | liter |
metre | meter |
theatre | theater or theatre |
Note that in American English, theater is the standard spelling, but the -re spelling is also commonly used, especially in proper names (the Lunt-Fontanne Theatre).