Natural is related to Nest. Nest is related to Stick. Stick is the opposite of Fall. Fall is related to Color. 
Drill can be used for Cut. Drill is related to Oil. Oil is related to Coal. Coal is related to Source. 
Natural <--RelatedTo--> Nest <--RelatedTo--> Stick <--Antonym--> Fall <--RelatedTo--> Color 
Cut <--UsedFor-- Drill <--RelatedTo--> Oil <--RelatedTo--> Coal <--RelatedTo--> Source 