I like the word 'spelunker'. It's not exactly in common usage but it crops up sometimes and I usually get to tell this story.
See, a while back, I was watching 'Who Wants To Be A Millionaire' and the question for £125,000 came up thus:
"What does a 'Spelunker' do?". I don't recall the possible answers but one of them was 'explores caves' and I knew that was it. The reason why I knew this was correct is due to the South Park movie, in which one charaxter is referred to as an 'ass-spelunker' and, well the other options available didn't make sense in that context!
So yeah, South Park knowledge can be worth many thousands of pounds. They should show it in primary schools.
ANYWAY, the reason I bring it up is due to a game called Specter Spelunker Shrinks and (despite being more of a demonstration of a neat concept than a fully fledged game) it features a nifty growing and shrinking character dynamic and some awesome alliteration, also!
So go play it. Although there's a chance you'll need to download something called the 'Unity Web Plug-in' which is totally legit so don't worry!