Mention is a synonym of Cite. Cite is related to Insight. Discovery is a type of Insight. Discovery is related to Educational. 
Hay is related to Dead. Dead is related to Coal. 
Mention <--Synonym--> Cite <--RelatedTo--> Insight <--IsA-- Discovery <--RelatedTo--> Educational 
Hay <--RelatedTo--> Dead <--RelatedTo--> Coal 