Pay is related to Income. Income is related to Payment. Payment is related to Price. Price is related to Evaluation. 
Essay is related to Term. Term is related to Force. Force is related to Energy. Energy is a synonym of Action. 
Pay <--RelatedTo--> Income <--RelatedTo--> Payment <--RelatedTo--> Price <--RelatedTo--> Evaluation 
Essay <--RelatedTo--> Term <--RelatedTo--> Force <--RelatedTo--> Energy <--Synonym--> Action 