Creating a search utility that would allow someone to find the word count for any book has proved challenging. Both goodreads.com and amazon.com offer services that allow programmers to pull book data, such as Title, Author, Numbers of Pages, etc. But neither offers word count.
Since I couldn't offer it here, I searched for other sites that provided a similar tool. Once upon a time Amazon offered "text stats" for a majority of their books, which included word count. Although Amazon stopped offering this for new books several years ago, the feature still remained for older books. So, hey, at least we have it for most books, right? Well ... within the past few months, Amazon has removed that feature completely from it's website. I suppose it just wasn't as important as the Amazon Echo.
But I kept looking, my friends, and eventually found AR Book Finder. This site is a great resource for writers, despite the fact that we're not actually the target audience. If you've never visited the site, you'll be asked if you're a Student, Parent, Teacher or Librarian when first arriving. I consider myself a student of life, so I selected student and continued on. I suspect you're a student of life too, so perhaps you should choose the same. From this point, search for your book, click on the title within the list of results, and on the following page you'll find the book's word count. Yay! Unfortunately they don't have all books, but they do have the most popular ones.
So we got that going for us; which is nice.