untouchable vs inviolable

untouchable is a noun but inviolable is not a noun.

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

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

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