I've just started using Certitude to verify my mystery caches, and noticed they had a keyword option where the solution is a word rather than a set of coordinates. I wanted to test it out and see how it works. The keyword you need here is actually the type of hide you'll be looking for once you've figured it out. I'm going to include three hints to get you on your way to finding the keyword you need. Good luck, and as always, happy caching!
1.) Often requires stealth
2.) Man-made
3.) If you know my hides, this is a no-brainer 😄
You can validate your puzzle solution with certitude.