Here are some examples:
* Action: The act of doing something.
* Reaction: A response to something.
* Conclusion: The end of something.
* Information: Facts or details.
* Solution: A way to solve a problem.
However, there are a few exceptions. Some words ending in "-ion" can also be adjectives or verbs.
Here are some examples:
* National: Relating to a nation.
* Conditional: Depending on a condition.
* Question: To ask a question.
* Function: To work or operate.
Therefore, to determine the part of speech of a word ending in "-ion," it's important to consider the context in which it is used.