Pronouns are words that replace nouns, like "he," "she," "it," "they," "this," "that," etc.
"Play" is a noun (the act of playing), a verb (to engage in play), or even an adjective (playtime), but it's not something you can replace with a pronoun.
Example:
* Noun: "The play was entertaining." (You can't replace "play" with a pronoun.)
* Verb: "The children are playing." (You can't replace "playing" with a pronoun.)
* Adjective: "We had a fun playdate." (You can't replace "playdate" with a pronoun.)
If you're trying to avoid repeating "play," you could use a synonym like "game," "activity," or "entertainment."