Bed is part of Bedroom. Bed is related to Wooden. Wooden is related to Chest. Chest is the opposite of Chance. 
Cave can be used for Darkness. Cave is a type of Explore. 
Bedroom <--PartOf-- Bed <--RelatedTo--> Wooden <--RelatedTo--> Chest <--Antonym--> Chance 
Darkness <--UsedFor-- Cave --IsA--> Explore 