Small is the opposite of Middle. Middle is related to Balance. Balance is a synonym of Compare. Compare is related to Distinguish. 
Deliver is the opposite of Receive. Receive is related to Catch. 
Small <--Antonym--> Middle <--RelatedTo--> Balance <--Synonym--> Compare <--RelatedTo--> Distinguish 
Deliver <--Antonym--> Receive <--RelatedTo--> Catch 