Happiness: a state of well-being and contentment; an emotion characterized by positive feelings and satisfaction. Example: She felt a sense of happiness wash over her as she watched the sunset.

Lightning: a sudden and powerful electrical discharge in the atmosphere, often accompanied by thunder. Example: The storm was so intense that the lightning lit up the entire sky.

Stress: a state of mental or emotional strain caused by adverse circumstances; a physical, chemical, or emotional factor that causes bodily or mental tension. Example: The pressure of the upcoming exam was causing her a lot of stress.

Fuel: any material that can be burned or otherwise used to produce energy; a substance that provides energy for power or heat. Example: The car needs fuel to run, so we stopped at the gas station to fill up.

Cold: a low temperature; lacking warmth or heat. Example: She shivered in the cold wind as she walked home from school.