Diminish is a synonym of Melt. Melt is a type of Blend. Blend is a synonym of Combination. Combination is related to Join. 
Interest is related to Balance. Balance is related to Profit. Profit is related to Payment. Payment is related to Fee. 
Diminish <--Synonym--> Melt --IsA--> Blend <--Synonym--> Combination <--RelatedTo--> Join 
Interest <--RelatedTo--> Balance <--RelatedTo--> Profit <--RelatedTo--> Payment <--RelatedTo--> Fee 