Rifle is related to Weapon. Tank is a type of Weapon. 
Grace is a synonym of Blessing. Blessing is related to High. High is related to Ideal. Ideal is related to Thought. 
Rifle <--RelatedTo--> Weapon <--IsA-- Tank 
Grace <--Synonym--> Blessing <--RelatedTo--> High <--RelatedTo--> Ideal <--RelatedTo--> Thought 