Fish is related to Whale. Whale is related to Boat. Boat is related to Sea. Sea is related to Dock. 
Window is related to Home. Home can be used for Relax. Relax is related to Calm. Calm is related to Smooth. 
Fish <--RelatedTo--> Whale <--RelatedTo--> Boat <--RelatedTo--> Sea <--RelatedTo--> Dock 
Window <--RelatedTo--> Home --UsedFor--> Relax <--RelatedTo--> Calm <--RelatedTo--> Smooth 