Natural is a synonym of Characteristic. Characteristic is related to Property. Magnitude is a type of Property. 
Retailer is derived from Retail. Retailer is related to Merchant. Merchant is related to Buy. 
Natural <--Synonym--> Characteristic <--RelatedTo--> Property <--IsA-- Magnitude 
Retail <--DerivedFrom-- Retailer <--RelatedTo--> Merchant <--RelatedTo--> Buy 