Probability
Yes, the word 'probability' is a noun, a singular, common, abstract noun; a word for the chance that something will happen; something that has a chance of happening; a measure of how often a particular event will happen; a word for a concept; a word for a thing.
The word, "Impossibility" refers to something that could never happen.
Opportunity.
"Cause" is the action word that makes something happen.
To "Cause" is a five letter action word makes something happen.
"Observe" means to watch something happen.
The word is "achieving" or "accomplishing."
Contingency
Permission for something to happen or agreement to do something.
The root word for chance is "cadere," which is Latin for "to fall." This reflects the idea of something happening by random or unpredictable circumstances.
To take a chance is to take a risk; to try something without being certain of the outcome.
The noun 'chance' is an abstract noun; a word for a possibility or probability of something; an opportunity to do or achieve something; occurrence in the absence of any obvious intention; a word for a concept.A concrete noun is something that can be experienced by any of the five physical senses; something that can be seen, heard, smelled, tasted, or touched; a word for a physical thing.The word 'chance' is also a verb and an adjective.