The first search result seems to give all the information you need - about
half way down - at http://www.starr.net/is/type/kbh.html#word - there is a
table of keyboard combinations for accented characters in Word.
Doesn't work on my machine. I tried several of the
suggestions but none of them work. I tried looking
up "accent" in the Word help files, but I didn't see
anything relating to what I needed.
Go To Tools > Customize > Keyboard
Under categories (on the left) select Common Symbols
Scroll dow the list on the right - pick out individual characters you are
interested in and see what (if any) shortcut keys are set.
Set new shortcuts if you wish.