I would generally concur with suki's response but add that, in the days of the "slide rule," nerds were well known for wearing "pocket protectors" which were plastic sleeves that fit into one's shirt pocket to minimize ink stains.

thank you very much now I know

They have similar meanings, but some people might think they are slightly different. I think the idealism with geeks is that they are much cooler than nerds. Nerds might study hard and work smarter, but many geeks might be emerced in video games and anime and mangas. Freak out and Flip out are the same thing.

No, they have the same meaning.