potential vs possibility

potential and possibility both are nouns.

Word	Noun	Adjective	Verb	Adverb
potential	Yes	Yes	No	No
possibility	Yes	No	No	No

As nouns, possibility is a hypernym of potential; that is, possibility is a word with a broader meaning than potential:

Other hypernyms of potential include possibleness.

potential (noun)	possibility (noun)
the difference in electrical charge between two points in a circuit expressed in volts	a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
the inherent capacity for coming into being	a possible alternative
	a future prospect or potential
	capability of existing or happening or being true

potential (adjective)	possibility (adjective)
existing in possibility
expected to become or be; in prospect