Yes, that’s right. It’s a book about words. Much like a dictionary. (See, Mrs Fanner? I wasn’t kidding back in Std 2 when I told you that I liked to read dictionaries for fun.)
And before you think, “Oh my goodness how boring why would anyone want to read a book about words”, let me remind you that you are currently on the Interwebs, reading largely insignificant snippets about someone else’s life. So let’s not throw stones, shall we?