Merchant is related to Job. Job is the opposite of Unemployment. Unemployment is a type of Situation. 
Mouth is the opposite of Eye. Eye is related to Biological. Biological is the opposite of Adopt. 
Merchant <--RelatedTo--> Job <--Antonym--> Unemployment --IsA--> Situation 
Mouth <--Antonym--> Eye <--RelatedTo--> Biological <--Antonym--> Adopt 