Sort is a synonym of Genre. Genre is related to Mystery. Mystery is the opposite of Known. Known is the opposite of Unknown. 
Pool is related to Swim. Swim is related to Style. Distinguish is etymologically related to Style. Distinguish is related to Find. 
Sort <--Synonym--> Genre <--RelatedTo--> Mystery <--Antonym--> Known <--Antonym--> Unknown 
Pool <--RelatedTo--> Swim <--RelatedTo--> Style <--EtymologicallyRelatedTo-- Distinguish <--RelatedTo--> Find 