untouchable vs invulnerable

untouchable is a noun but invulnerable is not a noun.

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

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

untouchable (adjective)	invulnerable (adjective)
forbidden to the touch	immune to attack; impregnable
impossible to assail
beyond the reach of criticism or attack or impeachment
not capable of being obtained
(especially used in traditional Hindu belief of the lowest caste or castes) defiling