They started as same word, but their meanings have drifted apart over time.
We'll tell you all the perpendiculars
We're intent on clearing it up
Why does it sound strange to say 'funner' or 'funnest?'
'Poets laureate'? 'Court-martials'? The curious history of postpositive adjectives in English.
Our research turned up two archaic literal meanings
What about Day Tomorrow?