Party can be used for Politics. Politician is derived from Politics. 
Network is a type of Communicate. Communicate is a synonym of Afford. Afford is the opposite of Expensive. Expensive is related to Cost. 
Party --UsedFor--> Politics <--DerivedFrom-- Politician 
Network --IsA--> Communicate <--Synonym--> Afford <--Antonym--> Expensive <--RelatedTo--> Cost 