I still don't know if there is a major difference between stims and tics... I do think tics are more something you *have* to do and you feel the urge to say specific things, whereas with stims it seems to be more comforting but you're less aware of what till come out.
I used to do a lot of squealing etc. and still sometimes do when I am overloaded, I do in the evenings often have really silly random things I say out loud.