untrained vs primitive

untrained is not a noun while primitive is a noun.

Word	Noun	Adjective	Verb	Adverb
untrained	No	Yes	No	No
primitive	Yes	Yes	No	No

untrained (noun)	primitive (noun)
	a word serving as the basis for inflected or derived forms
	a mathematical expression from which another expression is derived
	a person who belongs to an early stage of civilization

untrained (adjective)	primitive (adjective)
not disciplined or conditioned or made adept by training	used of preliterate or tribal or nonindustrial societies
	of or created by one without formal training; simple or naive in style
	little evolved from or characteristic of an earlier ancestral type
	belonging to an early stage of technical development; characterized by simplicity and (often) crudeness