What part of speech is the word marine?

The word "marine" can be several parts of speech, depending on how it's used in a sentence:

* Adjective: Describing something related to the sea or ocean.

* Example: "The marine life in the coral reef is breathtaking."

* Noun: A member of the United States Marine Corps.

* Example: "The marine saluted the officer."

* Noun: A sea animal.

* Example: "The marine biologist studied the behavior of the marine."

So, the part of speech for "marine" depends on the context.