What is the difference between Access and Excess?

What is the difference between Access and Excess? : 
Access : 

( 1 ) Means of approaching or entering a place – way in

Where is the access to the airport? 

His farmhouse is easy to access? 

( 2 ) Opportunity or right to use something or approach someone

Only high officials have access to The Prime Minister. 

Students must have access to a good library. 
Excess : 

( 1 ) More than the reasonable or expected or moderate degree or amount of something

Excess of anything is bad. 

An excess of fat in your diet can lead to heart disease. 

( 2 ) Going beyond the normal and accepted limit

Do not acrry your bag to excess. 

Do not drink to excess.