This is an easy one.  It is a raised garden bed filled with rotten wood.

 Something in a garden.

It sounds like something you need pesticide for.

I didn't know this but Google said Kathleen Daniels is right....

So interesting.  I recently started on of these and now I find out I am on the cutting edge of something old that has become new again!  

Thank you.

Composting comes to mind!

I would need to ask my agent.

As Kathleen Daniels wrote. I suspect a great place to grow mushrooms!

I like Kathleen's answer.

A catch all for composting and if lucky with seedlings some fruit for the hard labor!

Unknown.

Thanks Tony and Suzanne Marriott, Associate Brokers always love your Q's and the A's as well.

I have no idea. I can't even say the first word. 

Where Andre the Giant sleeps?

That would be a bed of nails

Hmm -- the word looks like something I might find in a German bakery or maybe thats the sound my stomach is making now --- hmm --- time for breakfast.  

Dig trench, sometimes useful on a hillside where trenches wind into a catch basin Line with old wood Do not use black walnut it's toxic. Stack them side by side. Even use a few s a raised bed frame. Fill the top with a lasagna of old fall golden leaves, next grass clipping, next perhaps vegetable scraps NO FATS nothing with meat. keep layering, a layer of your clay or yucky soil is fine too, then on top goes compost or mulch and go ahead an plant on it. Will take some pics for you

Thanks for detailed definition of 'Rain Garden',  Tony and Suzanne Marriott, Associate Brokers.

Sounds painful.