Shock is a type of Earthquake. Earthquake is related to Shake. 
Diminish is the opposite of Grow. Grow is related to Swell. Swell is a synonym of Mushroom. 
Shock --IsA--> Earthquake <--RelatedTo--> Shake 
Diminish <--Antonym--> Grow <--RelatedTo--> Swell <--Synonym--> Mushroom 