susceptible vs susceptibility

susceptible is not a noun while susceptibility is a noun.

Word	Noun	Adjective	Verb	Adverb
susceptible	No	Yes	No	No
susceptibility	Yes	No	No	No

susceptible (noun)	susceptibility (noun)
	the state of being susceptible; easily affected

susceptible (adjective)	susceptibility (adjective)
(often followed by `of' or `to') yielding readily to or capable of
easily impressed emotionally