Despite its discoloration and wear, its very likely that this old rolling pin is made of Hard Maple. (credits to wood-database.com)
Tree profiling based on its source, size, and intended use can also be helpful.
Some trees grow in specific environments so it would be easier for you to point out what tree was used in your acoustic guitar based on the manufacturer’s location; however, it should be noted that with the presence of cost-cutting, wood is imported from other countries and therefore, it’s relevant to simply ask the manufacturer of your item about its wood identity.
Also, you can ask for what purpose was it used.
Wooden floor planks are usually derived from Red Oak or Hard Maple, while closets are built from Aromatic Red Cedar.
Examine the end grain of a piece of lumber with a 10x magnifier. (via rockler.com)
The size of the panel or block can also assist you in determining the type of wood.
There are smaller trees that make good panels like the Gaboon Ebony.
The most helpful way you can do in order to properly identify the wood is to look at its end-grain closely through a magnifier.
In order to prepare and come up with a refined surface of ultra-dense wood products, rigorous sanding is preferably done over razor blade slicing (usually done in softwood).
To view the end-grain up close, use an at-least-10x-strong magnifier. Now, with the magnifier, look for unique spacing, colors, shapes, and other features.
The end-grain really speaks a lot about the wood itself.
Look for hardwood and softwood anatomy guides to assist you while spotting for particular features.
The bottom line here is that for you to find out what wood type is your item made of, look for unique features that could point to a certain species of wood.
If you think doing so is inconvenient for you and you have some extra bucks to spend, then you may opt to seek advice from wood experts.