Extension is a type of Property. Property is related to Own. Own is a synonym of Confess. Confess is a synonym of Concede. 
Dense is a synonym of Solid. Flower can be Solid. Flower is a synonym of Head. Head is related to Fog. 
Extension --IsA--> Property <--RelatedTo--> Own <--Synonym--> Confess <--Synonym--> Concede 
Dense <--Synonym--> Solid <--HasProperty-- Flower <--Synonym--> Head <--RelatedTo--> Fog 