Rent is related to Expense. Expense is related to Price. Price is related to Deal. Deal is a synonym of Stack. 
Mount is a type of Fix. Mount is a synonym of Climb. Climb is related to Human. European is a type of Human. 
Rent <--RelatedTo--> Expense <--RelatedTo--> Price <--RelatedTo--> Deal <--Synonym--> Stack 
Fix <--IsA-- Mount <--Synonym--> Climb <--RelatedTo--> Human <--IsA-- European 