Communication is related to Sound. Sound is similar to Substantial. 
Sale is related to Market. Market is related to Bull. Bull is a synonym of Pig. Pig is related to Cop. 
Communication <--RelatedTo--> Sound <--SimilarTo--> Substantial 
Sale <--RelatedTo--> Market <--RelatedTo--> Bull <--Synonym--> Pig <--RelatedTo--> Cop 