Suffer is a synonym of Hurt. Hurt is a synonym of Injure. Injure is a synonym of Abuse. 
Interesting is related to Sand. Sand is related to Sea. Sea is related to River. Main is a type of River. 
Suffer <--Synonym--> Hurt <--Synonym--> Injure <--Synonym--> Abuse 
Interesting <--RelatedTo--> Sand <--RelatedTo--> Sea <--RelatedTo--> River <--IsA-- Main 