Love is a type of Feeling. Love is a synonym of Sister. Sister is related to Aunt. 
Echo is related to Hearing. Hearing is related to Laugh. Laugh is related to Loud. 
Feeling <--IsA-- Love <--Synonym--> Sister <--RelatedTo--> Aunt 
Echo <--RelatedTo--> Hearing <--RelatedTo--> Laugh <--RelatedTo--> Loud 