Birth is a type of Beginning. Beginning is a synonym of Origin. Origin is related to Seed. 
Big is a synonym of Heavy. Heavy is related to Object. Bomb is a type of Object. Bomb can be used for Terror. 
Birth --IsA--> Beginning <--Synonym--> Origin <--RelatedTo--> Seed 
Big <--Synonym--> Heavy <--RelatedTo--> Object <--IsA-- Bomb --UsedFor--> Terror 