Stuttering is a complex vocal tic
Coprolalia is a complex vocal tic
Echolalia is a complex vocal tic
Muttering to oneself is a complex vocal tic
Talking to oneself is a complex vocal tic
Repeating words or sounds is a complex vocal tic
Uttering words or phrases out of context is a complex vocal tic
Palilalia is a tic which comprises of the repetition or echoing of a person's spoken words, which sounds roughly like stuttering.
Yes, repeating one's own last word or sound can be considered a complex vocal tic. Complex tics involve more elaborate movements or vocalizations compared to simple tics, and repeating one's own last word or sound falls into this category.
Coughing is a simple vocal tic
Grunting is a simple vocal tic
Humming is a simple vocal tic