I was only ever able to find two words out in the environment. You found three? Where?
The following is a spoiler, it took me a long time to find the third word:
You have to enter the farmhouse once, then attempt to cross the fields, continue through the wheat, and then wait. After some seconds, text will begin to appear, and then an option will appear that takes you to an encounter where you can get the third word. This encounter will require some trial and error, and is affected by how far you are in your transformation.