This book is intended for Americans and Britons who want to understand each other better, and for foreign students of either American or British English who want to familiarise (or familiarize) themselves with the other main variety of the language. According to George Bernard Shaw, the United States and England are two great nations separated by a common tongue. In fact, most of the time the two peoples understand each other fairly well, or think they do. The accent is different, of course, but it presents no more of a barrier than any regional accent would. Differences in grammar, syntax and spelling are relatively minor. The main differences, and they are huge, are lexical and cultural.
The A to Zed words lead me to the comprehension content of this book. But, in fact, my expectation was wrong. It's just some kind of "British English-American English" lax dictionary (A-Z). I hope this book can do something with my English skill.
More of an dictionary for some slangs from both dialects than anything else. Probably more interesting for Americans as the British words are more common people from the common wealth.