Silk is related to Product. Product is the opposite of Service. Service is related to Customer. Customer is a type of Consumer. 
Circuit is related to Electronics. Electronics is a type of Physics. Physics is related to College. College is related to History. 
Silk <--RelatedTo--> Product <--Antonym--> Service <--RelatedTo--> Customer --IsA--> Consumer 
Circuit <--RelatedTo--> Electronics --IsA--> Physics <--RelatedTo--> College <--RelatedTo--> History 