Premium is similar to Superior. Superior is similar to Dominant. Dominant is similar to Supreme. 
Discovery is similar to Finding. Finding is related to Direction. Direction is related to Back. 
Premium <--SimilarTo--> Superior <--SimilarTo--> Dominant <--SimilarTo--> Supreme 
Discovery <--SimilarTo--> Finding <--RelatedTo--> Direction <--RelatedTo--> Back 