General:
* Action: The process of doing something.
* Creation: The act of bringing something into existence.
* Dedication: The act of committing oneself to a cause.
* Education: The process of learning and teaching.
* Information: Facts or data.
* Invitation: A request to attend an event.
* Motivation: The reason for doing something.
* Nation: A group of people sharing a common culture and history.
* Observation: The act of noticing something.
* Preparation: The act of making ready for something.
* Regulation: A rule or law.
* Situation: The way things are.
* Vacation: A period of time away from work.
* Variation: A difference or change.
Scientific:
* Adaptation: The process of adjusting to a new environment.
* Evaporation: The process of a liquid turning into a gas.
* Oxidation: The process of combining with oxygen.
* Dehydration: The process of losing water.
* Radiation: The emission of energy.
* Fermentation: The chemical breakdown of a substance.
Descriptive:
* Celebration: A happy event.
* Expectation: A belief that something will happen.
* Imagination: The ability to form mental pictures.
* Inspiration: A feeling of enthusiasm and creativity.
* Perspiration: Sweat.
* Relaxation: A state of calmness and peace.
* Reservation: A doubt or hesitation.
Other:
* Application: A formal request for something.
* Communication: The exchange of information.
* Concentration: The act of focusing on something.
* Continuation: The act of carrying on something.
* Determination: Firmness of purpose.
* Explanation: A statement that makes something clear.
* Negotiation: The process of discussing something to reach an agreement.
* Organization: A group of people working together.
* Presentation: A formal talk or demonstration.
* Realization: The act of becoming aware of something.
* Transformation: A change or alteration.
This is just a small sample of the many words that end in -ation. The suffix -ation is very common in English, and it can be used to form a wide variety of nouns.