Accept is a type of React. React is a synonym of Respond. Respond is the opposite of Call. Call is related to Interaction. 
Answer is related to Truth. Truth is a synonym of Judge. Judge is related to System. System is related to Sun. 
Accept --IsA--> React <--Synonym--> Respond <--Antonym--> Call <--RelatedTo--> Interaction 
Answer <--RelatedTo--> Truth <--Synonym--> Judge <--RelatedTo--> System <--RelatedTo--> Sun 