Fork is a different concept from Knife. Knife can be used for Killing. Sword can be used for Killing. Sword can be used for Kill. 
Support is related to Purpose. Purpose is related to Inspiration. Inspiration is related to Motive. 
Fork <--DistinctFrom--> Knife --UsedFor--> Killing <--UsedFor-- Sword --UsedFor--> Kill 
Support <--RelatedTo--> Purpose <--RelatedTo--> Inspiration <--RelatedTo--> Motive 