Anita J. answered 12/18/19
Persian Teacher & Material Writer/International Translator/Interpreter
Off the top of my head, I can think of these words:
khob or Ba'ad meaning then
Ya'ani: This word literally means "it means", but when you use it as a filler, it has no meaning or significance. For example: Ya'ani, delam mikhad alan bekhaabam./ ----, I want to sleep right now.
Although these words are used as fillers, you cannot just randomly use them they way you would "um" or "err". They still carry a sense of collocation with them.
I hope this helps.
Best,
Anita