Conversation is related to Interview. Interview is related to Employer. Employer is a type of Leader. Leader is a synonym of Driver. 
Discussion is related to Topic. Topic is a synonym of Issue. Issue is a synonym of Question. 
Conversation <--RelatedTo--> Interview <--RelatedTo--> Employer --IsA--> Leader <--Synonym--> Driver 
Discussion <--RelatedTo--> Topic <--Synonym--> Issue <--Synonym--> Question 