stacked words in nav bar - Avenue Template

I'd like one of the multi-word page titles in my nav bar to stack one word on top of the other so it does not take up so much horizontal room on the bar. I am using Avenue template. The site as it currently stands can be found here: https://www.amberdkempthorn.com/

I'd like "Older Work" to be aligned so that "work" displays under "older." I may add additional pages in the future that I'd also like to apply this feature to. Any assistance or suggestions would be greatly appreciated! 

@mrgnhghs If you can edit Nav item title to

Older<span class="tuan"> Work</span>

then, you can add this code to Home > Design > Custom CSS

span.tuan {
    display: block;
}