If you want the dictionary definition, just double click on any word.

nor (conjunction) nor is always used in the negative, usually before the second or last of a set of negative possibilities, we use it after 'neither'.

For example:-

He drinks neither wine nor beer.

or (conjunction) or is used to connect different possibilities.

For example:-

Is it Tuesday or Wednesday today?

!Note - If you don't use "neither" you can use "or".

For example:-

He doesn't drink wine or beer.