Hardwood and softwood specifications are here.
Types of wood
There are 2 types of wood, hardwood and softwood.
Hardwood comes from flowering trees called angiosperms that usually have broad leaves and softwood comes from gymnosperm trees which bear cones and needle like leaves. Another difference is hardwood has pores, whereas softwood doesn’t have pores.
Hardwood is usually slower growing than softwood species.
Not all hardwoods are harder than softwoods and visa versa.