invulnerable vs untouchable

invulnerable is not a noun while untouchable is a noun.

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

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

invulnerable (adjective)	untouchable (adjective)
immune to attack; impregnable	forbidden to the touch
	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