Cruel is a synonym of Brutal. Brutal is similar to Direct. Direct is a type of Instruct. Instruct is a type of Inform. 
Discipline is a type of Trait. Trait is related to Voice. 
Cruel <--Synonym--> Brutal <--SimilarTo--> Direct --IsA--> Instruct --IsA--> Inform 
Discipline --IsA--> Trait <--RelatedTo--> Voice 