As expected, British and American English have different styles of spelling words that have the same meaning, but a letter or more could make the difference.
These are the differences we should not forget:
*Generally, -tre is British while –ter is American.
*Words in British English with -our are written as -or in American English.
Exception: glamour, from Scot.
In American English, glamour is used instead of glamor because it is considered the correct form.
*In British English, words ending in l take another l when adding endings that begin with a vowel, but the single l is maintained in American English.
Exceptions: propelled, rebelled, revealed/revealing and civilian are used in both British and American English.
*In British English, –yse is the standard, but Americans use -yze. However, -ise and -ize are acceptable in British English, but it is –ize in American English.
*In British English, some words ending in -ence are spelt –ense in American English.
* Words with -oe and -ae in British English are spelt with only -e in American English.
Exceptions: Americans use both archaeology and archeology.
* Words ending in -ogue in British English are spelt with either -og or -ogue in American English.
The words listed above are generally used with -ogue in both British and American English, although catalog is widely used in the US.
In addition, vivid differences between these two varieties include:
*In general speech, British English uses some words that are not common in American English. For example, the auxiliary verb shall is more common in British English to express the future.
- Shall we talk to them today? (British)
- Should we talk to them today? (American)
*Also, question tags are more common in British English than American; the latter uses them less often.
* And, have got is used often in British English, while Americans prefer have.
- Have you got blue ink? (British)
- Do you have blue ink? (American)
* Finally, speakers of British English use the present perfect tense more than their American counterparts.
Br: Have you served the guests yet?
US: Did you serve the guests yet?
Br: I’ve already spoken.
US: I already spoke.
Summarily, British and American English are almost utterly disparate (different in every way). If you however remember the basics of the aforementioned points, understanding the differences would be simpler.