Which aspect of language is likely to be most different in American English and British English?
abstract nouns
short prepositions
slang words and phrases
mathematical terminology
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The answer would be - slang words and phrases. American and British English often differ greatly in such words as: highway (AmE) = motorway (BrE), or cookie (AmE) = biscuit (BrE), or diaper (AmE) = nappy (BrE), etc.