Realm is a synonym of Field. Field is related to Course. 
Tired is related to Exhaust. Play is a type of Exhaust. Play is related to Pass. Pass is related to Toll. 
Realm <--Synonym--> Field <--RelatedTo--> Course 
Tired <--RelatedTo--> Exhaust <--IsA-- Play <--RelatedTo--> Pass <--RelatedTo--> Toll 