adverb

1. Also; in addition.

2. Used to emphasize an additional point, especially an important or stronger reason; Moreover; furthermore.

   “I don't feel like going out tonight. Besides, I have to work tomorrow morning anyway.”

3. Otherwise; else.

   “I have been to Spain but nowhere besides.”

preposition

1. In addition, in addition to.

2. Other than; except for; instead of.

   “I don't want to go anywhere besides India.”

3. Beside.

Synonyms: beyond, on top of, barring, besides, save for