inviolable vs untouchable

inviolable is not a noun while untouchable is a noun.

Word	Noun	Adjective	Verb	Adverb
inviolable	No	Yes	No	No
untouchable	Yes	Yes	No	No

inviolable (noun)	untouchable (noun)
	belongs to lowest social and ritual class in India

inviolable (adjective)	untouchable (adjective)
incapable of being transgressed or dishonored	forbidden to the touch
not capable of being violated or infringed	impossible to assail
immune to attack; incapable of being tampered with	beyond the reach of criticism or attack or impeachment
must be kept sacred	not capable of being obtained
	(especially used in traditional Hindu belief of the lowest caste or castes) defiling