Argue is a synonym of Reason. Reason is related to Human. Human is related to Leg. 
Agreement is related to Free. Person does not want (to) Free. Lion is a type of Person. Lion is a type of Predator. 
Argue <--Synonym--> Reason <--RelatedTo--> Human <--RelatedTo--> Leg 
Agreement <--RelatedTo--> Free <--NotDesires-- Person <--IsA-- Lion --IsA--> Predator 