Dirty is the opposite of Clear. Clear is related to Window. Window is related to Fresh. 
Mountain is related to Ridge. Ridge is a type of Beam. Beam is related to Member. Member is related to Relation. 
Dirty <--Antonym--> Clear <--RelatedTo--> Window <--RelatedTo--> Fresh 
Mountain <--RelatedTo--> Ridge --IsA--> Beam <--RelatedTo--> Member <--RelatedTo--> Relation 