Yama. Who the hell ever heard of yama? I did. It's an exotic wood from, I think, Hawaii, and is super-light while being adequately strong. Back in the 50s and 60s, if you wanted an ultra-light rifle, you looked for a nice yama blank.
Laminated.** Laminated stocks go back at least to World War II when the Germans stocked Mauser 98s with them. Strong, stable, and heavy. The most recent development in laminated wood is blanks with fancy veneer glued to the outer surfaces, so that your laminated stock looks like a homogeneous hunk of walnut for which you paid a fortune. With the best of these, you have to look very, very hard to see that it's actually a glue job.