Labor is a synonym of Dig. Dig is a synonym of Shot. Shot is related to Medical. Medical is related to Fever. 
Fare is related to Fee. Fee is related to Money. 
Labor <--Synonym--> Dig <--Synonym--> Shot <--RelatedTo--> Medical <--RelatedTo--> Fever 
Fare <--RelatedTo--> Fee <--RelatedTo--> Money 