Spouse is related to Mother. Mother is related to Relative. Relative is the opposite of Absolute. 
Bombing is a type of Attack. Attack is a synonym of Round. Round is a different concept from Square. 
Spouse <--RelatedTo--> Mother <--RelatedTo--> Relative <--Antonym--> Absolute 
Bombing --IsA--> Attack <--Synonym--> Round <--DistinctFrom--> Square 