1. Spelling: British English tends to use more "u" in words such as colour, flavour, and behaviour, while American English drops the "u" in these words (color, flavor, behavior).
2. Vocabulary: There are many differences in vocabulary between British and American English. For example, in British English, a "biscuit" is a cookie, while in American English, a "biscuit" is a type of bread roll. Similarly, in British English, a "boot" is the trunk of a car, while in American English, a "boot" is a type of footwear.
3. Pronunciation: There are also differences in pronunciation between British and American English. For example, the word "schedule" is pronounced with a "sh" sound in British English, but with a "sk" sound in American English.
4. Grammar: There are some differences in grammar between British and American English. For example, in British English, it is common to use the present perfect tense (e.g. "I have just finished my homework"), while in American English, the simple past tense is often used in the same context (e.g. "I just finished my homework").
5. Punctuation: There are some differences in punctuation between British and American English. For example, in British English, single quotation marks are often used for direct speech, while in American English, double quotation marks are more common.
6. Idioms and expressions: There are many idiomatic expressions that are unique to either British or American English. For example, in British English, people might say "it's raining cats and dogs" to describe heavy rain, while in American English, people might say "it's raining buckets."