Here are some examples:
* "The fly buzzed around the fruit." (referring to the insect)
* "There's a fly in my soup!" (referring to the insect)
* "The fly on the fishing rod was very realistic." (referring to a type of lure)
* "The pilot took the plane for a fly." (referring to a short flight)
However, "fly" can also be a verb:
* "The birds fly south for the winter."
* "I can fly a kite."
* "Please don't fly your drone near the airport."
So, whether "fly" is a noun or a verb depends on its usage in a sentence.