Tension is a type of Stress. Tension is a type of Strain. 
Pistol can be used for Killing. Killing can cause/lead to Grief. Grief is related to Tremendous. Tremendous is a synonym of Awful. 
Stress <--IsA-- Tension --IsA--> Strain 
Pistol --UsedFor--> Killing --Causes--> Grief <--RelatedTo--> Tremendous <--Synonym--> Awful 