They started as same word, but their meanings have drifted apart over time.
Head, shoulders, metaphors, and toes
Some practical guidance, and interesting history, about a common mistake.
Is it all the same anyway?
Comedian ISMO tries to figure out 'one' and 'two'
'Poets laureate'? 'Court-martials'? The curious history of postpositive adjectives in English.
We believe the popular usage of this word is correct