Boss is a synonym of Head. Head is related to Boy. Boy is related to Toy. Toy is related to Childhood. 
Premium is a type of Bonus. Premium is the opposite of Discount. Discount is a synonym of Reduction. 
Boss <--Synonym--> Head <--RelatedTo--> Boy <--RelatedTo--> Toy <--RelatedTo--> Childhood 
Bonus <--IsA-- Premium <--Antonym--> Discount <--Synonym--> Reduction 