Is there a term for words, phrases, etc. that on their own don't add any semantic information to a sentence.
For example "Well" in "Well, I'm about to tell you" or "I mean" ind "I mean, I never met him". If you just remove those from the sentence no information is lost, but they sort of change the connotation or "feel" for what is said. I'm sure there are more examples for this and a better definition than what I've come up with.
All I want to know is if there is a name for words and phrases serving that particular role.