Case is related to Business. Business is related to Permit. Permit is a synonym of Prohibit. Prohibit is the opposite of Let. 
Anger is etymologically related to Anxious. Anxious is a synonym of Concerned. 
Case <--RelatedTo--> Business <--RelatedTo--> Permit <--Synonym--> Prohibit <--Antonym--> Let 
Anger --EtymologicallyRelatedTo--> Anxious <--Synonym--> Concerned 