Introduction:
A word processor is a software application used for creating, editing, formatting, and printing documents. It is designed to handle text-based documents and provide various features like spell check, grammar check, formatting options, and more. In this question, we need to identify which option is not an example of a word processor.

Explanation:
Let's analyze each option and determine if it is a word processor or not.

a) IBM Lotus Symphony:
IBM Lotus Symphony is a software suite that includes a word processor, spreadsheet program, and presentation software. The word processor component of Lotus Symphony is called "Lotus Symphony Documents." Therefore, option 'a' is a word processor.

b) Microsoft Excel:
Microsoft Excel is a spreadsheet program, not a word processor. It is primarily used for creating, editing, and analyzing numerical data in tabular form. Therefore, option 'b' is not a word processor.

c) Google Docs:
Google Docs is a web-based word processor offered by Google. It allows users to create, edit, and collaborate on documents online. It provides features similar to traditional word processors, making it a valid example of a word processor. Therefore, option 'c' is a word processor.

d) Microsoft Word:
Microsoft Word is one of the most popular and widely used word processors. It offers a wide range of features for creating, editing, formatting, and printing documents. Therefore, option 'd' is a word processor.

e) Notepad:
Notepad is a basic text editor included with Microsoft Windows. It is a simple program that allows users to create and edit plain text documents. However, it lacks the advanced features typically found in word processors, such as formatting options and spell check. Therefore, option 'e' is not a word processor.

Conclusion:
Based on the analysis above, the correct answer is option 'B' - Microsoft Excel. It is a spreadsheet program, not a word processor.