What part of speech is apple?

"Apple" can be several parts of speech depending on how it's used in a sentence:

* Noun: This is the most common usage, referring to the fruit itself.

* Example: "I ate a red apple."

* Adjective: It can describe something that is made of or related to apples.

* Example: "She bought a apple pie."

* Proper Noun: It can refer to the specific company Apple Inc.

* Example: "I bought a new iPhone from Apple."

So, to determine the part of speech, you need to look at the context of the sentence.