See Synonyms in Document : Microsoft Word 2003

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Introduction - Microsoft Word 2003 Window - Selecting Objects - Page Setup - Print - Find, Replace & Goto - Cut-Paste & Copy-Paste - Header & Footer - Clip Art - Fill Effect - Format Font - SubScript & SuperScript - Bullets & Numbering - Border & Shading - Spelling & Grammar - Synonyms - Protect Document - Macro - Customize Toolbars - AutoCorrect

Synonyms options shows the similar meaning of the word.

Steps:
1) Right click on the word.
2) Place the mouse on the Synonym option.
3) It will show the synonyms