The most significant differences between British and American English are in their pronunciations, their vocabularies, and their spelling. There are grammatical differences, too, but these are less important and harder to describe, so we will pass over them for today.
Pronunciation
British English and American sound noticeably different. The most obvious difference is the way the letter r is pronounced. In British English, when r comes after a vowel in the same syllable (as in car, hard, or market), the r is not pronounced. In American English the r is pronounced. To hear some good examples of this difference, click on this link and watch the YouTube video.
https://www.youtube.com/watch?v=2nAnT3PASak
Vocabulary
There are many differences in American and British English vocabulary. Here are 10 common words in American English followed by their British English equivalents:
American / British
Spelling
Finally, there are spelling differences. Below are three rules you can follow.