Doctor is related to Care. Care is related to Charity. Charity is related to Donor. 
Thing is related to Product. Product is related to Silk. Silk is related to Exotic. Exotic is a synonym of Ethnic. 
Doctor <--RelatedTo--> Care <--RelatedTo--> Charity <--RelatedTo--> Donor 
Thing <--RelatedTo--> Product <--RelatedTo--> Silk <--RelatedTo--> Exotic <--Synonym--> Ethnic 