preposition

Besides means "in addition to" or "as well as".

adverb

Besides means "in addition to", "apart from", or "moreover".

Example

preposition

1. Besides his parents, he has two siblings.
2. Besides work, he also likes to play video games.
3. Besides English, he speaks two other languages.

adverb

1. Besides, I also need to buy some food.
2. He is a talented singer, besides being a great dancer.
3. Besides the movie, we also have to finish our homework.