Terrain is related to Hill. Hill is related to Home. Home is related to Mom. Mom is a type of Parent. 
Dark is related to Blind. Blind is the opposite of Look. Look is related to Protect. 
Terrain <--RelatedTo--> Hill <--RelatedTo--> Home <--RelatedTo--> Mom --IsA--> Parent 
Dark <--RelatedTo--> Blind <--Antonym--> Look <--RelatedTo--> Protect 