What part of speech is crush?

"Crush" can be several parts of speech depending on its use in a sentence:

* Verb: It can mean to press something forcefully, as in "The weight of the car crushed the can."

* Noun: It can refer to a strong feeling of romantic attraction towards someone, as in "He had a crush on his classmate."

* Noun: It can also refer to the act of crushing something, as in "The crush of the crowd was intense."

So, without context, it's impossible to definitively say what part of speech "crush" is. You need to look at how it's used in the sentence to determine its grammatical role.