Site Stucture Advice - Keyword Dillema

[bThere]

I am creating a new site and am looking for some advice on how to structure the site

Using Google's keyword search tool it seems like I have a dilemma in that about 50% of the keyword pairs are contained in 10 keyword pairs that are similar

The first two pairs have about 49% of the traffic and only differ between plural / singular, not quite sure how to handle that, or if google has a method to make these more or less synonomous

The last 8 pairs are roughly similar in distribtuion

As an example (not my case, just for visualization)

Mountain Bike Classes

Mountain Bike Instruction

Mountain Bike Workshops

Mountain Bike Training

Etc ... which all more or less give the same results (yes some difference but they all deal with learning how to ride a mountain bike, again this is not my exact case, don't care a whit about mountain bikes

I don't see giving each of those kinds of pairs their own page since the content would be pretty much the exact same, making it substantially different would also be problematic (if I am thinking about this correctly)

I have a clean slate to work with from a site perspective so I am wondering how people here would, or better yet have handled similar situations

[bThere]

The mountain bike examples were just for illustration, the actual keywords are different than described but the principle is the same.

Actually I did use PPC research, and they pretty much bring up the same content (slight, very slight variations but in general they could be considered the exact same market segment )

So I guess other than splitting the results I will just grab the top performer that I think I have the best chance at getting good results with and maybe PPC the others if it makes economic sense.

Thanks for the answers.

[ao.com]

Singular and plural are (more or less) synonymous.

Regarding your main question, I would try to make sure that there was no subtle difference in user intent that you might have missed.

To use the example that you give someone looking for "mountain bike training" might be more interested in formal training than someone looking for "mountain bike workshops" while someone seeking "mountain bike instruction" might only want to attend a single session . It might even be worth testing some theories out using PPC.

You could also consider branching off slightly from the keyword tool's suggestions. Again using the example  you give you could create a page about mountain bike instructors - possibly optimising it to the term "mountain bike instruction", using it to write relevant content but with a significantly different angle to your other pages and also as a way to build relationships with the community of mountain bike instructors.