There's not really an answer to this question. A book could have no words, or it could have hundreds of thousands.
If it helps, the Nebula Awards make a distinction between "works of between 17,500 and 40,000 words" and "works of 40,000 words or more", calling the former novellas and the latter novels. Both novels and novellas have been published as books... Hemingway's The Old Man and the Sea, for example, has about 26,500 words.
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Usually, when you see a bold-faced word in a non-fiction book, it means that there is a glossary in the back of the book where you can find the definition of the bold-faced words.
Face Book cook ace boo foe
I have to say 4, because that's usually the number of words to be made with a birthday song.
Hot for Words is a book that teaches people things about words they never knew. It is not appropriate for children because the book teaches things in an adult manner.
Nouns