Change is the opposite of Payment. Payment is related to Due. Due is related to Indication. 
Concern is a synonym of Worry. Worry is a type of Rub. Rub is related to Disappear. 
Change <--Antonym--> Payment <--RelatedTo--> Due <--RelatedTo--> Indication 
Concern <--Synonym--> Worry --IsA--> Rub <--RelatedTo--> Disappear 