Guess it depends on what OP means by "all words", but sure. 
# works like wc
perl -ne 's/\s+/$i++/eg;END{print "$i\n"}' f1 f2

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Not sure why you have the "i" modifier.

In reply to Re^4: problem count the number of words -- oneliner by kschwab
in thread problem count the number of words by GHMON

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