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Hi Cheeke
So you're going through the TEFL 20 hours grammar module hey?
Waiting is not a noun
While is only a nouns if it's preceded by "a", if you say "while I was going" then it' not a noun. When it's a noun, it's abstract
I think smell and air are both concrete, as you can smell a smell and you can feel air on your skin. But for those two it can be debatable so your tutor won't mark you down either way for those is what I think... and hope, for my own sake!