Expense is the opposite of Cheap. Cheap is the opposite of Precious. Appreciate is etymologically related to Precious. 
Vessel is related to Eye. Eye can be used for Learning. Learning is related to Read. Read is related to Admit. 
Expense <--Antonym--> Cheap <--Antonym--> Precious <--EtymologicallyRelatedTo-- Appreciate 
Vessel <--RelatedTo--> Eye --UsedFor--> Learning <--RelatedTo--> Read <--RelatedTo--> Admit 