✅ 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.

✅ Fill means to extend or be present throughout (The smell of fresh bread filled the room).

✅ Permeate means to saturate and become spread throughout something (Happiness permeated everything she wrote).

✅ Both of these words refer to a thing, such as a smell or mood, becoming tangible or present in every part of something.

✅ Permeate is a fancier, more formal word than fill.

✅ Develop means to elaborate on something, giving it more detail, depth, or scope (develop an argument).

✅ Expand means to express something in more detail or give it more scope (expand your point).

✅ Both of these words mean to make something more detailed and usually larger in consequence.

✅ Develop emphasizes improving what you already have, whereas expand emphasizes filling it out beyond what was there (I developed my ideas; I expanded my portfolio).