Boast is a synonym of Blow. Storm is a type of Blow. you are likely to find Storm in/at/on Sky. Sky is related to Rocket. 
Area is a synonym of Zone. Zone is related to Tank. 
Boast <--Synonym--> Blow <--IsA-- Storm --AtLocation--> Sky <--RelatedTo--> Rocket 
Area <--Synonym--> Zone <--RelatedTo--> Tank 