* Verb: This is the most common usage. It means to give food to someone or something.
* Noun: It can refer to the food given to animals, often in the form of "animal feed."
* Noun: It can also refer to the act of feeding, as in "the feed of the baby birds."
Let me know if you have a specific sentence in mind, and I can tell you the part of speech for "feed" in that context!