I generally use the Character Viewer arrows. i leave it on the menu bar on my Macs, System Prefs > Keyboard > Show keyboard and Emoji viewers in menu bar. Also useful for a host of other characters and symbols.
Alternately, Word has a way to create keyboard shortcuts for symbols. In a word doc, choose the insert tab > Advanced Symbol and select the arrow, then click the Keyboard shortcut button and press whatever keys you want to assign to insert that character.