One being instructed at elementary level? Would that mean that a pupil = a catechumen?

And, if so, what would a student at average level be?

And, if such a term, what would a comparable student at advanced level be?

And, if such a term, what would the master be?

We have our everyday terms (pupil, student, scholar, master, professor), but I'm asking here about any hierarchy that would be directly related to catechumen.