Final answer:
In physics, the term 'weight' is most closely associated with 'substance,' as weight is the force of gravitational attraction on an object and varies based on location.
Step-by-step explanation:
The word weight matches the concept of substance closest when thinking in terms of physics. In this context, weight is defined as the force caused by the gravitational attraction that operates on an object. Therefore, the answer is (d) substance. It's important to note that weight differs depending on location because it depends on the local gravitational field strength, unlike mass, which remains constant regardless of location.