Pupil - person who is being taught especially in child in a school while student is considered as more older one.

Hi Dora A pupil is someone who is being taught; a student may be this too, but can also be just someone who is studying, not being taught by someone. I don't think age has very much to do with it, except that when you are young you are more likely to be taught than simply studying.

pupil in school ,but student in heighschool or university or institut

what is pupil ?