Reply is the opposite of Inquiry. Inquiry is a synonym of Question. Question is a synonym of Proposal. 
Snap is a type of Talk. Talk is related to Discuss. Discuss is a synonym of Discourse. 
Reply <--Antonym--> Inquiry <--Synonym--> Question <--Synonym--> Proposal 
Snap --IsA--> Talk <--RelatedTo--> Discuss <--Synonym--> Discourse 