primitive vs untrained

primitive is a noun but untrained is not a noun.

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

primitive (noun)	untrained (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

primitive (adjective)	untrained (adjective)
used of preliterate or tribal or nonindustrial societies	not disciplined or conditioned or made adept by training
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