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The standard Emacs distribution contains functions for counting the number of lines and words within a region.
Certain types of writing ask you to count words. Thus, if you write an
essay, you may be limited to 800 words; if you write a novel, you may
discipline yourself to write 1000 words a day. It seems odd, but for a long
time, Emacs lacked a word count command. Perhaps people used Emacs mostly
for code or types of documentation that did not require word counts; or
perhaps they restricted themselves to the operating system word count
command, wc. Alternatively, people may have followed the publishers’
convention and computed a word count by dividing the number of characters in
a document by five.
There are many ways to implement a command to count words. Here are some
examples, which you may wish to compare with the standard Emacs command,
count-words-region.