Spelling & Grammar Tab

Spelling

Check spelling as you type - Checks spelling automatically and marks errors as you type. (Proofing tab).
Hide spelling errors in this document - (document specific) Hides the wavy red line under possible spelling errors in your document. If you clear this check box, Word marks possible spelling errors with wavy red lines that are visible on the screen but that do not print. To display a list of suggested spelling corrections; click the wavy line with the right mouse button. (Proofing tab, Hide spelling errors in this document only).
Always suggest corrections - Automatically displays a list of suggested spellings for misspelled words during a spelling check. This check box does not affect background spelling checking.
Suggest from main dictionary only - Suggests correct spellings from the main dictionary but not from any open custom dictionaries. Clear this check box if you want Word to suggest correct spellings from all open custom dictionaries as well as from the main dictionary.
Ignore words in uppercase - Ignores words in uppercase letters during a spelling check.
Ignores words with numbers - Ignores words that contain numbers during a spelling check.
Ignore internet and file addresses - Select this check box if you want Word to automatically ignore Internet addresses (e.g. http://www.bettersolutions.com), file names (e.g. C:\temp\File1.doc) and electronic mail addresses (e.g. feedback@bettersolutions.com) during a spelling check.
Custom dictionaries - Lists the currently active custom user dictionaries. Word uses the listed custom dictionaries, in addition to the main spelling dictionary, when you run the spelling checker. When you click Add during a spelling check, Word adds the entry to the currently selected dictionary in the Custom dictionary list. To change the Custom dictionary list, click Dictionaries. Activates, creates, edits, adds, or removes custom dictionaries. If a custom dictionary appears in the Custom dictionary list on the left, it is already activated.

Grammar

Check grammar as you type - Checks grammar automatically and marks errors as you type. This responsible for red underlining of grammar. (Proofing tab, Mark grammar errors as you type).
Hide grammatical errors in this document - (document specific) Hides the wavy green line under possible grammatical errors in your document. If you clear this check box, Word marks possible grammar errors with wavy green lines that are visible on the screen but that do not print. To display a list of suggested grammar corrections, click the wavy line with the right mouse button. (Proofing tab, Hide grammatical errors in this document only).
Check grammar with spelling - Clear this check box if you want to check spelling but not grammar. This check box is unavailable if the grammar checker is not installed for the language of the current selection. This check box does not affect background grammar checking. (Proofing tab).
Show readability statistics - Clear this check box if you don't want Word to display the Readability Statistics dialog box after you run the grammar checker. This check box does not affect background grammar checking. (Proofing tab).
Writing style - Click the writing style you want Word to use to check grammar in this document. For example, if this document is a scientific manuscript, click Technical. To create your own custom writing style, click Custom at the bottom of the Writing style list, and then click Settings. (Proofing tab).
Settings - Customizes the writing style and grammar rules that Word uses for grammar checking. This button is unavailable if the grammar checker is not installed for the language of the current selection. (Proofing tab).

Proofing Tools

Recheck document - Document checks the spelling and grammar again after you change spelling and grammar options or open a custom or special dictionary. The button name is Check Document if you haven't yet run the spelling and grammar checker during this Word session. When you click Recheck Document, Word also resets the internal Ignore All list. This means that, during the next spelling and grammar check, Word will check all words for which you previously clicked Ignore All. The name of the button was changed in 2007 back to Check Document. (Proofing tab).