* Noun: This is the most common usage, referring to the customs, arts, social institutions, and achievements of a particular nation, people, or group.
* Example: "The culture of Japan is rich in history and tradition."
* Verb: This usage is less common, but it means to cultivate or grow something.
* Example: "We culture bacteria in the lab for research purposes."
* Adjective: While not as frequent, "culture" can be used as an adjective to describe something related to or characteristic of culture.
* Example: "She has a strong culture background."
Therefore, the most common part of speech for "culture" is a noun.