Priority is related to Important. Important is a synonym of Grave. Grave is related to Site. 
Structural is similar to Functional. Functional is the opposite of Organic. Metal cannot be Organic. Metal is related to Ring. 
Priority <--RelatedTo--> Important <--Synonym--> Grave <--RelatedTo--> Site 
Structural <--SimilarTo--> Functional <--Antonym--> Organic <--NotHasProperty-- Metal <--RelatedTo--> Ring 