They started as same word, but their meanings have drifted apart over time.
You don't have to end all your adverbs in -ly to talk right.
There, there. We'll sort it out.
A definitive answer.
How to 'amuse-bouche' without begging pardon for your French
Comedian ISMO on the complexities of the word 'tip'
Soop, wimmen, and headake did not make the cut