This vocab word is exactly the same as its parent kanji, including its meaning as well: book. It doesn't have those other meanings though, when it's just 本 alone, it's just a book.
The reading for this word is the same as the single kanji it comes from.
Where did you buy this book?
The book cover that Koichi bought from a spooky French person was covered with genuine leather.
If you want to read a book here, you have to give me some gold.