Conversation is a synonym of Discourse. Discourse is a synonym of Discuss. 
Reinforce is a synonym of Reward. Reward is a different concept from Punishment. Punishment is the opposite of Nice. 
Conversation <--Synonym--> Discourse <--Synonym--> Discuss 
Reinforce <--Synonym--> Reward <--DistinctFrom--> Punishment <--Antonym--> Nice 