* Noun: This is the most common use. It refers to the act of exploring.
* Example: "The exploration of space has led to many scientific discoveries."
* Verb: It can be used as a verb, meaning to explore.
* Example: "We explored the ancient ruins for hours."
* Adjective: Though less common, it can act as an adjective meaning "relating to exploration."
* Example: "The exploration team discovered a new species of insect."
Therefore, the specific part of speech depends on the context in which "exploration" is used.