They started as same word, but their meanings have drifted apart over time.
We'll tell you all the perpendiculars
Comedian ISMO on the complexities of the word 'tip'
Some imitative words are more surprising than others
'Mischievous,' 'nuclear,' and other words to pronounce with caution.
Is it all the same anyway?
Why don't they call it the Merriam-Webster comma?