Reverse words

Puts the words in the opposite order while leaving each word spelled correctly. "one two three" becomes "three two one".

This is a different operation from reversing the characters, and the distinction matters: reversing characters gives "eerht owt eno", which is not what anyone asking for reversed words wants. The whitespace between words is preserved rather than normalised, so a double space stays a double space and the result keeps whatever spacing the original had. For anything more structured — reversing a list where each item is a line — the reverse-lines option is the one you want, since it treats each line as the unit rather than each space-separated token.