What's the difference between Merriam-Webster's online dictionary?

And the book? I'm thinking about purchasing it. or should I purchase the latest oxford dictionary?



~I'm not quite sure if there's a significant difference between BrE English and AmE English but I'm into learning American English.What's the difference between Merriam-Webster's online dictionary?
The only difference is that one is online and the other is printed on paper that you can hold in your hands.

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