Spelling errors appear in red, while grammatical errors appear in blue or green (depending on your version).
To fix a mistake, click a correction in the suggestion list (or type your correction into the box), and then click Change. To skip this instance of the error, click Ignore. To skip all instances of this error in the document, click Ignore All. If you don’t want Word to ever report a certain spelling as incorrect, click Add to add it to your dictionary.
Spelling mistakes are underlined with a red squiggly line. Grammar issues are underlined with a blue or green squiggly line.
To replace an error with one of the suggestions in the menu, click it now. To ignore the error and remove its squiggly underline, click Ignore. If you don’t want Word to report a certain spelling as an error in the future, click Add to Dictionary. This option may not be available on all Word versions.