Nouns:
* Admission: The act of allowing someone to enter a place or group.
* Ascension: The act of rising to a higher position or level.
* Collision: A crash between two or more objects.
* Conclusion: The end or final part of something.
* Decision: A choice made after considering different options.
* Discussion: A conversation about a particular topic.
* Expansion: The act of becoming larger or more extensive.
* Explosion: A sudden burst of energy or noise.
* Invasion: The act of entering a country or place with military force.
* Revision: The act of changing something to make it better or more accurate.
* Suspension: The act of temporarily stopping something.
* Tension: A feeling of stress and anxiety.
Verbs:
* Conclude: To end something or reach a decision.
* Decide: To make a choice.
* Discuss: To talk about a topic.
* Expand: To become larger or more extensive.
* Explode: To burst suddenly with great force.
* Invade: To enter a country or place with military force.
* Revise: To change something to make it better or more accurate.
* Suspend: To temporarily stop something.
These are just a few examples, and there are many other words using "-sion". It's a versatile suffix that can be used to form nouns and verbs, often related to the action or process of something.