✅ Fatigue means to make someone weary through mental or physical exertion (Our week-long hike fatigued me greatly).

✅ Exhaust means to drain someone’s strength through exertion (I exhausted myself running around all day).

✅ Both of these words mean to tire someone out.

✅ Fatigue suggests a more persistent or chronic feeling of tiredness than exhaust (Walking up the stairs fatigues me more now after my illness).

✅ Base refers to the bottom part, which usually is a key part of a support structure. Base can also refer to the most fundamental part of something (the base of the mountain; the base of an argument).

✅ Nadir refers to the lowest or deepest point (The nadir of his career came when he lost out on an award).

✅ Both of these words refer to a point from which something grows or rises.

✅ However, nadir suggests a low point and is often negative, whereas base suggests something strong that can be built up from.

✅ Fuel means to supply something with food, nourishment, or something else that keeps it going (Anger fueled my outburst; I fueled myself with a protein-rich breakfast).

✅ Feed means to supply something with nourishment (Dry twigs fed the fire; Feed children a balanced diet).

✅ These words can often be used interchangeably. Both mean to provide something that is necessary so that a person or action can continue.