Here are some examples of how it's used as a verb:
* "We talked for hours."
* "The teacher talked about the importance of education."
* "Can you talk louder?"
However, "talk" can also be a noun, depending on the context:
* "We had a long talk."
* "She gave a talk about her research."
So, the part of speech for "talk" depends on how it's used in a sentence.