Choice of Words: Sleeps means to be in a state of rest with the eyes closed and without consciousness. Soundly means in a deep or undisturbed manner.
Alternative Expressions
The bear is sleeping soundly.
Meaning: This means that the bear is sleeping very deeply and peacefully. It is not disturbed by anything and is resting comfortably.
Choice of Words: The Bear is the subject of the sentence and it is doing the action of sleeping. Is sleeping is the verb and it tells us what the bear is doing. Soundly is an adverb and it describes how the bear is sleeping. It means that the bear is sleeping deeply and peacefully.