Over on wikipedia, they describe a "Geek" here.
Also, on wikipedia, they describe a "Nerd" here.
Finally, on bigthink.com, they ask, "Are You a Geek or a Nerd? The Difference Really Is in the Data" here.
There's been a rash of discussion lately (it happens periodically) on the D&D legacy and I thought I would give my own perspective. ...