FA names I entered in menu items didn’t display any icon at all

I stumbled upon that myself as well when I realized that most FA names I entered in menu items didn’t display any icon at all. Woodmart evidently comes with a light subset embedded, that doesn’t contain the entire lot. If anyone still seeks a remedy to this issue, this is how I did it:

1. Visit https://fontawesome.com/v4.7.0/get-started/, enter your email and get a script delivered to your inbox.
2. Open up your functions.php (Appearance > Theme Editor) and paste this snippet there:

function alex_head_inject() {
    ?>
        [THE FONTAWESOME SCRIPT YOU GOT IN YOUR EMAIL]
    <?php
}
add_action('wp_head', 'alex_head_inject');

3. Save changes. That’s it. Happy fontawesoming.