Coin is related to Leaf. Leaf is a synonym of Thumb. Thumb is a different concept from Finger. you are likely to find Bacteria in/at/on Finger. 
Mess is related to Trouble. Trouble is the opposite of Song. 
Coin <--RelatedTo--> Leaf <--Synonym--> Thumb <--DistinctFrom--> Finger <--AtLocation-- Bacteria 
Mess <--RelatedTo--> Trouble <--Antonym--> Song 