Are there any words that are almost completely universal?

I’m always amazed by the fact that facial expressions that correlate with emotions are pretty much the same across cultural lines…the grimace, shoulder shrug, etc…at least in my experience.
It got me to thinking, are there any words, or sounds that mean something (uh uhh, mmm mmm, etc.), that most cultures share? “No” or something similar is the only one I can think of.