sensitivity vs susceptibleness

sensitivity and susceptibleness both are nouns.

Word	Noun	Adjective	Verb	Adverb
sensitivity	Yes	No	No	No
susceptibleness	Yes	No	No	No

As nouns, susceptibleness is a hypernym of sensitivity; that is, susceptibleness is a word with a broader meaning than sensitivity:

Other hypernyms of sensitivity include susceptibility.

sensitivity (noun)	susceptibleness (noun)
the ability to respond to physical stimuli or to register small physical amounts or differences	the state of being susceptible; easily affected
the ability to respond to affective changes in your interpersonal environment
(physiology) responsiveness to external stimuli; the faculty of sensation
sensitivity to emotional feelings (of self and others)
susceptibility to a pathogen