You see these images a lot on e-commerce websites like Amazon. I want to search for these images on google and I don't know the exact wording for these type of images, or if there is one. Please tell me what terms I should search for if I want to find images that show the product in relation to human height. I have already tried many obvious searches.
It seems like you are looking for Orthographic drawings/projections. You can always photoshop a picture of a human and it's height besides the images.
I don't think you will find an archive of dimensioned specified objects next to a dimensioned human though.
Perhaps you are searching for something like this: https://i.pinimg.com/736x/d4/bc/70/d4bc702cce51856f9849e61fe41df708--human-figures-concept-diagram.jpg
Either way, you should use the search terms: person, dimensions, schematics, table (for example).
I think you're going about this incorrectly. The idea is to make your own. These are likely done in 3D modeling software and then added a human for scale. Engineers and Architects often have libraries of things like people to use in renderings and visualizations.
If you want to do it with product photography you should take your photo of the product and use a raster image editor to superimpose a human and a scale on it yourself.
A quick search on any number of stock websites for "people silhouettes" will get you a decent catalog to work with: Shutterstock: 106273379