• day-pupil,
• dey-pupil,
• dai-pupil,
• saypupil,
• xaypupil,
• caypupil,
• faypupil,
• raypupil,
• eaypupil,
• dzypupil,
• dsypupil,
• dwypupil,
• dqypupil,
• datpupil,
• dagpupil,
• dahpupil,
• daupupil,
• deypupil,
• daipupil,
• deipupil

The adjective form of "daypupil" is "daypupil's".

The plural form of the word "daypupil" is "daypupils"

The singular form of "daypupil" is "daypupil" itself. It does not change in the singular form.