nor vs since

nor

• Than. 

• A function word introducing each except the first term of a series, indicating none of them is true. 

• And... not (introducing a negative statement, without necessarily following one). 

• Used to introduce a further negative statement. 

since

• Because. 

• From the time that. 

• From a specified time in the past. 

• At certain points during that period of time. 

• Continuously during that period of time.