* Verb: This is the most common usage. It refers to the act of moving air forcefully, as in "The wind blows hard."
* Noun: It can refer to a sudden forceful movement of air, such as "The blow knocked him off his feet."
* Noun: It can also refer to a hit or strike, as in "He landed a powerful blow."
To determine the correct part of speech, you need to consider the sentence structure and the meaning of the word in context.