One term is ' discourse device s'. The kind you mention are for social and conversational maintenance. Grammatically, they are 'interjections' .
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
MM, is a discourse device the same as a discourse marker?Maybe. Personally, I use discourse device as the more general term, considering that discourse markers are those that more specifically indicate change of turn, change of topic, connectivity, etc. But I may be distinguishing the terms when they are really synonymous.