Missionary is related to Position. Slot is a type of Position. 
Identity is the opposite of Difference. Difference is related to Slope. Slope is related to Rate. Rate is related to Room. 
Missionary <--RelatedTo--> Position <--IsA-- Slot 
Identity <--Antonym--> Difference <--RelatedTo--> Slope <--RelatedTo--> Rate <--RelatedTo--> Room 