Personal organizer and Writing pad

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..

Writing pad and personal organizer are semantically related. In some cases you can use "Writing pad" instead a noun phrase "Personal organizer".

Writing pad noun - A pad of paper on which messages can be written.

Personal organizer and writing pad are semantically related. You can use "Personal organizer" instead a noun phrase "Writing pad".