What are the Limitations in a word processor module?

Word is a Word processor, so it is designed for that particular kind of work. It can be used to do other things, even calculations like a spreadsheet, but you would use something like Excel to do that. It is not a desktop publisher, so it doesn't have the level of functionality for creating plush magazines etc., though the gap between what a Word processor can do and what a desktop publisher can do, is not as great as it once was. So it depends on what it is that you want to do.