Action Words (verbs)
* Admission: admit (to allow entry)
* Ascension: ascend (to move upward)
* Concession: concede (to yield or give in)
* Confession: confess (to acknowledge a fault)
* Conclusion: conclude (to bring to an end)
* Compression: compress (to press together)
* Conversion: convert (to change)
* Decision: decide (to make a choice)
* Digression: digress (to stray from the main topic)
* Discussion: discuss (to talk about)
* Dispersion: disperse (to scatter)
* Evasion: evade (to avoid)
* Extension: extend (to make longer)
* Expansion: expand (to make larger)
* Explosion: explode (to burst outwards)
* Expression: express (to convey)
* Fusion: fuse (to melt together)
* Incision: incise (to cut into)
* Invasion: invade (to enter by force)
* Obsession: obsess (to preoccupy)
* Precision: precise (very exact)
* Progression: progress (to move forward)
* Reversion: revert (to return to a former state)
* Revision: revise (to change or improve)
* Suspension: suspend (to hang or delay)
* Tension: tense (to stretch tightly)
* Transgression: transgress (to break a rule)
* Version: (various forms of something)
Nouns
* Abduction: abduct (to kidnap)
* Allusion: allude (to refer indirectly)
* Collusion: collude (to secretly cooperate)
* Conclusion: conclude (to bring to an end)
* Deception: deceive (to mislead)
* Depression: depress (to make sad)
* Dimension: (a measurement of length, width, or height)
* Division: divide (to separate)
* Eruption: erupt (to burst forth)
* Erosion: erode (to wear away)
* Excursion: excurse (to go on a trip)
* Expansion: expand (to make larger)
* Fission: (the splitting of an atomic nucleus)
* Illusion: illude (to deceive)
* Imposition: impose (to force upon)
* Intrusion: intrude (to enter without permission)
* Mission: (a task or assignment)
* Omission: omit (to leave out)
* Percussion: percuss (to strike)
* Possession: possess (to own)
* Precession: precede (to go before)
* Provision: provide (to supply)
* Revision: revise (to change or improve)
* Session: (a period of time for a meeting)
* Subversion: subvert (to overthrow)
* Vision: (the ability to see)
This is not an exhaustive list, but it gives you a good starting point.
Important Note: The "-sion" suffix is often used to create nouns from verbs. However, there are exceptions, and sometimes the "-sion" suffix indicates an action rather than a thing.