They started as same word, but their meanings have drifted apart over time.
English was never the same after the Norman Conquest
The best way to find information in the dictionary
And who put it there, anyway?
Why does it sound strange to say 'funner' or 'funnest?'
'Mischievous,' 'nuclear,' and other words to pronounce with caution.
How 'literally' can mean "figuratively"