Proclaim is a synonym of Announce. Cry is a type of Announce. Cry is etymologically related to Greet. Letter can be used for Greet. 
Notion is a type of Concept. Whole is a type of Concept. Heal is etymologically related to Whole. 
Proclaim <--Synonym--> Announce <--IsA-- Cry --EtymologicallyRelatedTo--> Greet <--UsedFor-- Letter 
Notion --IsA--> Concept <--IsA-- Whole <--EtymologicallyRelatedTo-- Heal 