How many words in a book?

A book of two to three hundred pages, generally, is somewhere in the neighborhood of 70,000 words, more or less. Of course, a book could be measured in fewer pages if there’s no problem with the publisher chosen for this. In other words, a book may be composed of 10,000 words, or, like the case is with children's books, even a dozen of sentences would suffice. The more complex problem radicates perhaps in that there is no particular science in order to determine how a work is better than the other; we rely on critics for that sort of thing, and critics' formation plays a fundamental role on it. But whatever the case, critics, in general, are not known to be always kind to no-names works. Oh, well, we’ll see what transpires over time. Because I plan to polish and nurture the book I already wrote, and then when I’m done perfecting it, which by no means equates perfection, I will deliver not the very best I can but at least a good of high quality.
What about the complex of not being good enough? It’s relatively understandable that the writer who suffers from this malady often is a very demanding individual. I wrote on this particular subject before, and it is my belief that those who grow personally tend to write more maturely. But writing endlessly is of no use, and there are those who are not good enough for their own good, so let’s leave it at that.