The condition of being possible
plausibility, feasibility, potentiality, likelihood; see chance 1, probability.
A possible happening
hazard, chance, contingency, occasion, circumstance, hope, occurrence, fortuity, hap, happening, outside chance, incident, instance; see also accident 2, event 1, opportunity 1.
"possibility." YourDictionary, n.d. Web. 16 May 2018. <http://thesaurus.yourdictionary.com/possibility>.
possibility. (n.d.). Retrieved May 16th, 2018, from http://thesaurus.yourdictionary.com/possibility
The likeliness of a given event occurring:
Something that may occur or be done: