Vegetable is related to Grain. Grain is related to Farm. Farm is related to Rural. 
Direction is related to Top. Tail is a type of Top. Tail is a type of Organ. 
Vegetable <--RelatedTo--> Grain <--RelatedTo--> Farm <--RelatedTo--> Rural 
Direction <--RelatedTo--> Top <--IsA-- Tail --IsA--> Organ 