Gathering is a synonym of Meeting. Meeting is related to Event. Event is related to Attack. Bombing is a type of Attack. 
Minute is the opposite of Large. Large is a different concept from Average. Average is related to Unique. 
Gathering <--Synonym--> Meeting <--RelatedTo--> Event <--RelatedTo--> Attack <--IsA-- Bombing 
Minute <--Antonym--> Large <--DistinctFrom--> Average <--RelatedTo--> Unique 