Telescope is a synonym of Scope. Contrast is a type of Scope. Contrast is a synonym of Difference. 
Listener is derived from Listen. the last thing you do when you Listen is Respond. Respond is a synonym of Field. Field is related to Medicine. 
Telescope <--Synonym--> Scope <--IsA-- Contrast <--Synonym--> Difference 
Listener --DerivedFrom--> Listen --HasLastSubevent--> Respond <--Synonym--> Field <--RelatedTo--> Medicine 