NERD: A socially inadequate person who is noted not only for their poor social skills or lack of caring of mainstream interests and styles, but for their intelligence, display of said intelligence, and deep knowledge of a wide variety of fields or a specified field. The big difference between a geek and a nerd is that a Nerd's brilliance is usually within academic pursuits. They are Science geeks, math geeks, computer geeks. If it is an academic field with real life applications or at least has a real field of study and you are intellectually vested in it, you are a nerd.
GEEK: A subset of hobbyist, people who have an deep interest in traditionally non-mainstream subjects that are often considered childish in nature. Similar to the Nerd, they are usually socially inadequate and brilliant. Unlike the nerd, their brilliance tends to be dedicated to their specific hobby. Usual interests of Geeks fall under Science-Fiction and Fantasy Genres spanning all mediums.Problem is, I was defining geek by what we like rather than how we like it which appears to be the common theme I found in my journeys.
Another aspect of Geeks as defined by The Game Overthinker in his video on continuity found here. the short and paraphrased version is this: "Geeks glean fun from turning something that is already fun into work" such as playing video games competitively, Stop Having Fun Guys, or collecting the entirety of the Marvel universe's comics to "keep the continuity straight".