Unemployment is the opposite of Job. Job is related to Merchant. Merchant is related to Retailer. 
Swell is related to Balloon. Balloon is a type of Expand. Expand is related to Learn. Learn is related to Swim. 
Unemployment <--Antonym--> Job <--RelatedTo--> Merchant <--RelatedTo--> Retailer 
Swell <--RelatedTo--> Balloon --IsA--> Expand <--RelatedTo--> Learn <--RelatedTo--> Swim 