Nut is a type of Seed. 
Seller is a different concept from Buyer. Buyer is the opposite of Merchant. Merchant is etymologically related to Merit. Merit is a synonym of Virtue. 
Nut --IsA--> Seed 
Seller <--DistinctFrom--> Buyer <--Antonym--> Merchant --EtymologicallyRelatedTo--> Merit <--Synonym--> Virtue 