Ensure is a synonym of Guarantee. Deposit is a type of Guarantee. Deposit is related to Transaction. Transaction is related to Payment. 
Secure is related to Lock. Lock is related to Road. 
Ensure <--Synonym--> Guarantee <--IsA-- Deposit <--RelatedTo--> Transaction <--RelatedTo--> Payment 
Secure <--RelatedTo--> Lock <--RelatedTo--> Road 