Rest is related to Relief. 
Defendant is a synonym of Suspect. Suspect is a synonym of Accuse. Accusation is etymologically related to Accuse. Allegation is a type of Accusation. 
Rest <--RelatedTo--> Relief 
Defendant <--Synonym--> Suspect <--Synonym--> Accuse <--EtymologicallyRelatedTo-- Accusation <--IsA-- Allegation 