Test is a synonym of Essay. Essay is related to Book. Book is related to Introduction. Introduction is a synonym of Lead. 
Confusion is related to Lost. Lost is related to State. Explain is a type of State. Explain is related to Elaborate. 
Test <--Synonym--> Essay <--RelatedTo--> Book <--RelatedTo--> Introduction <--Synonym--> Lead 
Confusion <--RelatedTo--> Lost <--RelatedTo--> State <--IsA-- Explain <--RelatedTo--> Elaborate 