Agent is related to Officer. Officer is a synonym of Policeman. Policeman is related to Male. 
Radical is the opposite of Slight. Slight is related to Hill. Hill is related to Ski. 
Agent <--RelatedTo--> Officer <--Synonym--> Policeman <--RelatedTo--> Male 
Radical <--Antonym--> Slight <--RelatedTo--> Hill <--RelatedTo--> Ski 