Hostile is a synonym of Cold. Cold is related to Blood. Blood is related to Force. 
Concede is a type of Give. Give is the opposite of Obtain. Obtain is a synonym of Achieve. 
Hostile <--Synonym--> Cold <--RelatedTo--> Blood <--RelatedTo--> Force 
Concede --IsA--> Give <--Antonym--> Obtain <--Synonym--> Achieve 