Bottom is the opposite of Head. you are likely to find Head in/at/on Helmet. Helmet is related to Protective. Protective is similar to Tender. 
Partnership is a type of Contract. Partnership is a type of Business. 
Bottom <--Antonym--> Head --AtLocation--> Helmet <--RelatedTo--> Protective <--SimilarTo--> Tender 
Contract <--IsA-- Partnership --IsA--> Business 