I'm thinking of a word, something having to do with a farm...
Check out this puzzle at http://shygypsy.com/farm/p.cgi - you start with a phrase ("On the Farm"), and then you try to come up with words to fill in the blanks. (What's something that's three letters and is on a farm? MOO? Nope. Close, though. Sorry, spoiler.)
As you go on, you unlock more and more words, and more and more pages. Some of the stuff seems like it's OK to use Google on, some that just seems like cheating. Use your judgment. I'm around 60% of the way through, I figure - I've finished one full page, and I'm one or two words away from several other pages, but as you can see (above), I've got several pages I haven't unlocked yet.
The puzzle's set up to encourage collaboration, but only by merging players' progress - if I've done the rightmost 80% of the game, and you've done the leftmost 80%, we could merge our progress and be (pretty much) done. If we wanted to just see what we've solved in common, there doesn't seem to be a tool to do that (though I suspect I might be able to make one, I'm that clever).
I'd be happy to give or receive gentle hints along the way. Let me know.