Hidden is a synonym of Invisible. Invisible is related to Hear. Hear is a different concept from Look. 
Paper is related to Product. Product is related to Consumer. Consumer is a type of Person. Person is related to Pioneer. 
Hidden <--Synonym--> Invisible <--RelatedTo--> Hear <--DistinctFrom--> Look 
Paper <--RelatedTo--> Product <--RelatedTo--> Consumer --IsA--> Person <--RelatedTo--> Pioneer 