Servant is related to Low. Low is the opposite of Class. Class is related to Environment. 
Premium is similar to Superior. Superior is related to Extraordinary. Extraordinary is the opposite of Ordinary. Ordinary is related to Basic. 
Servant <--RelatedTo--> Low <--Antonym--> Class <--RelatedTo--> Environment 
Premium <--SimilarTo--> Superior <--RelatedTo--> Extraordinary <--Antonym--> Ordinary <--RelatedTo--> Basic 