"Foundation" Natural Recordings by Native Speakers
The word "foundation" refers to the base or starting point of something, often a structure, organization, or idea. It can also refer to the act of establishing or laying the groundwork for something.
Foulness refers to the state or quality of being foul or unpleasantly bad. It can also describe something that is filthy, dirty, or unwholesome. In a more figurative sense, it can imply moral corruption or wickedness. For example, "The foulness of the air was overwhelming in the city after the industrial disaster."