A young person said to me once: "I would have no idea what to say to a homeless person."
"That's easy," I replied. "Talk to them about anything except homelessness."
But I am someone who has lived outdoors — not just for a while, but for years on end. During those years, I associated largely with others who were in the same boat. I learned how such people generally speak of themselves. As a result, I use the words "outside" and "outdoors" more than either of the other two--and I feel compelled to explain why.