count-words-regioncount-words-region is an interactive compiled Lisp function in `
simple.el'. It is bound to M-=.
(count-words-region START END &optional ARG) Count the number of words in the region. If called interactively, print a message reporting the number of lines, words, and characters in the region (whether or not the region is active); with prefix ARG, report for the entire buffer rather than the region. If called from Lisp, return the number of words between positions START and END.