What is another word for pupil?

There isn't really a single perfect synonym for "pupil" because it can have different meanings depending on the context.

Here are some options, depending on what you mean:

If you mean the black center of the eye:

* Iris (while technically the colored part, the pupil is the opening within the iris)

* Pupillary aperture (more technical)

If you mean a student:

* Learner

* Scholar

* Student (this is just the most common synonym)

* Disciple (implies a more devoted following)

If you mean the "pupil" of someone's eye:

* Ward (implies someone under your care)

* Protégé (implies someone you're mentoring)

It's important to consider the specific context to choose the most appropriate word.