Anyways, I'd be OK to start using a new term, if "coroutine" is
confusing.
According to Wikipedia, term "coroutine" was first coined in 1958, so several generations of computer science graduates will be familiar with the textbook definition. If your use of "coroutine" matches the textbook definition of the term, I think you should continue to use it instead of inventing new names which will just confuse people new to Python.