how can I put a macron over the letter "m" in MS Word? I'm running MS Word 16.16.5 on macOS Mojave 10.14.1. I can't figure out how to put a macron over the letter "m". I can create with vowels but not consonants with the ABC-Extended. 

Any suggestions?
Type m and then ⌥ Option⇧ Shift A.  You may need to change the font to get it to look good.