I’ve written a joke:
What’s the difference between nerds and geeks?
“I don’t know, what is the difference between nerds and geeks?”
Before I address the question of the differences, please allow me to first address the similarities. The two terms are commonly used interchangeably to describe a physically-unimposing person with specialist knowledge or shameless enthusiasm for specific intellectual pursuits; for instance, technical or scientific subjects often coupled with deep knowledge about a hobby. Hobbies popular amongst geeks and nerds include but are not limited to science fiction/fantasy, comics, superheroes, manga/anime, puzzle solving, history, and even sports statistics.