Lamp is related to Switch. Leap is a type of Switch. Leap is a type of Transition. 
Fade is a synonym of Weaken. Weaken is a synonym of Undermine. Undermine is a different concept from Assure. 
Lamp <--RelatedTo--> Switch <--IsA-- Leap --IsA--> Transition 
Fade <--Synonym--> Weaken <--Synonym--> Undermine <--DistinctFrom--> Assure 