Appointment book and Personal organizer

Appointment book noun - A book containing a calendar and space to keep a record of appointments.

Personal organizer and appointment book are semantically related. In some cases you can use "Personal organizer" instead a noun phrase "Appointment book".

Personal organizer noun - A lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; can serve as a diary or a personal database or a telephone or an alarm clock etc..

Appointment book and personal organizer are semantically related. You can use "Appointment book" instead a noun phrase "Personal organizer".