Loan is etymologically related to Lend. Lend is the opposite of Borrow. 
Base is related to Diamond. Diamond can be used for Drill. Drill is a type of Device. Device is related to Telephone. 
Loan --EtymologicallyRelatedTo--> Lend <--Antonym--> Borrow 
Base <--RelatedTo--> Diamond --UsedFor--> Drill --IsA--> Device <--RelatedTo--> Telephone 