What part of speech is surprize?

The Word 'surprise' is a noun (surprise, surprises) and a verb (surprise, surprises, surprising, surprised).

The noun 'surprise' is a Word for an unexpected thing or event.

Examples:

It was a nice surprise to see my old classmate. (noun)

We cleaned our room to surprise our mom. (verb)

A pronoun is a Word that takes the place of a noun in a sentence.

Example: We cleaned our room to surprise our mom. I hope she will smile. (the pronoun 'she' takes the place of the noun 'mom' in the second sentence)