Comment is a synonym of Notice. Notice is a type of Review. Review is a type of Article. 
Infection is a type of Illness. Infection is a type of Disease. Injury is a type of Disease. Panic can cause/lead to Injury. 
Comment <--Synonym--> Notice --IsA--> Review --IsA--> Article 
Illness <--IsA-- Infection --IsA--> Disease <--IsA-- Injury <--Causes-- Panic 