Is there a word for saying "um" or "uh", etc, during speaking? Or a word for "um" and "uh", etc?
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Ahem, I would say exclamations.
The Oxford English Dictionary agrees:
The word for sounds made that are not communicative, such as "er", "uh", "um", etc, and also for interruptions in speech, are generally called "nonfluencies". They indicate the person is thinking of what they will say next, either calling attention to their next statement, or if overused, indicating the speaker is not comfortable with the language they are using, or with speaking in general.
The Toastmasters groups in the U.S. ring a bell (ding) every time a nonfluency is heard from a speaker practicing at a meeting. It's distracting, and meant both to point out the nonfluency and throw the speaker off their game, possibly resulting in more. The idea is that nonfluencies imply unpreparedness and nervousness, which the groups members are there to train out of themselves to improve their public speaking.
However, some studies have shown that speech with no nonfluencies is actually paid less attention to by the listener than speech with a few "natural" nonfluencies. A person who starts an answer to a question with a short "uh" or "er" calls attention to the fact they are about to speak, heightening the listener's attention.
I think you'll find that "umming and ahing" is in most dictionaries as a phrasal verb.