Ctrl+C. Copy selected text or graphics to the Office Clipboard.
Ctrl+V. Paste the most recent addition to the Office Clipboard.
Ctrl+X. Deletes selected text (which can then be copied elsewhere)
Ctrl+F. Opens a search box to FIND specific words in the document
Ctrl+W. Close the active window / document.
Ctrl+Z. Undo an action.
Ctrl+Y. Redo the last action or repeat an action.
Ctrl+S. Save a document.
Ctrl+P. Print a document.
Ctrl+K. Insert a hyperlink.
Alt+Left. Arrow Go back one page.
Alt+Right. Arrow Go forward one page.
Ctrl+Shift+A. Format all letters as capitals.
Ctrl+B. Applies or removes bold formatting.
Ctrl+I. Applies or removes italic formatting.
Ctrl+=. Apply subscript formatting (automatic spacing).
Alt, F, A. Save As.
Alt, S, T, I. Insert Table of Contents.
Alt, S, T, R. Remove Table of Contents.
Alt, W, F. Full Screen Reading – View > Document Views > Full Screen Reading.
Alt, W, R. Ruler. View > Show/Hide > Ruler.
Alt, F, X. Exit Word.
(Adapted from jramos)