candle
The French word for candle is bougie. It is a feminine noun and is used in the same way as the English word. For example, you might say, 'J'ai acheté une bougie parfumée' (I bought a scented candle).
The candle is on the table.
This simple sentence is a declarative statement, indicating the position of an object, in this case, a candle, relative to another object, namely, a table.
I bought a new scented candle.
In this sentence, the subject 'I' bought a new object, which is a 'scented candle'. The object is specified further by the word 'scented', which is an adjective in this context.
The car's spark plug needs to be changed.
In this sentence, 'bougie' refers to a 'spark plug' in a car, a completely different meaning from the literal 'candle'. 'Must be changed' indicates a necessary action to be taken.