Holdthescroll I think you're looking to narrow. My guess is you're new to ppc and search which is cool. But what you'll find is the obvious words may not be your best words. For example what about broken pipe, fix toilet or pipe fixer. There's hundreds of words that could pull traffic for your terms. Something interesting to do if you can afford it is bid on the broad match term and track your referers. This will show you all the different searches related to you terms that are coming in. It'll also let you see which are converting for you. For example you could broad match plumbing, plumber, pipe, toilet, sink, flood, overflow or contractor/s. Of course those are just a few random examples and most of those words are going to be at a loss for you. Which means you'll want to start adding negative words quickly. The beauty of all this is it happens in real-time and you're getting this data for a relatively small cost.
Productionhead with regards to your isn't it obvious comment. I think you'll find it isn't. Also a lot of things I may see as obvious you may not see as well. My experience is I've found most disciplines are mutually exclusive I think. Do you know about CPM buys, Mailing, PPC, SEO, BH SEO, being an advertiser.... etc etc? My guess is probably not, we're in the newbie section and it can be a lot of work to just learn one discipline none the less 2 or 3. The more you do this stuff the more you'll see how things link together from a top down view. if you want to make yourself sound smart and belittle people the newbie section isn't the place to do it. These people are just trying to learn man and a lot of the stuff you see as obvious they're still new to.