This is the 9945th most frequent Spanish word.
bujía
Spark plug.
In this context, 'bujía' is used metaphorically to indicate an inspiring or initiating element for action.
La idea fue la bujía que encendió el proyecto.
The idea was the spark that ignited the project.
In this sentence, 'bujía' refers to the spark plug, a component of an engine that ignites the fuel-air mixture.
La bujía del coche se dañó y necesitó ser reemplazada.
The car's spark plug got damaged and needed to be replaced.
Here, 'bujía' is used to describe a candle or a small light source, showing an alternate meaning of the word.