natural vs intelligent

natural is a noun but intelligent is not a noun.

Word	Noun	Adjective	Verb	Adverb
natural	Yes	Yes	No	No
intelligent	No	Yes	No	No

natural (noun)	intelligent (noun)
(craps) a first roll of 7 or 11 that immediately wins the stake
a notation cancelling a previous sharp or flat
someone regarded as certain to succeed

natural (adjective)	intelligent (adjective)
(of a parent or child) related by blood; genetically related	having the capacity for thought and reason especially to a high degree
in accordance with nature; relating to or concerning nature	endowed with the capacity to reason
existing in or produced by nature; not artificial or imitation	exercising or showing good judgment
existing in or in conformity with nature or the observable world; neither supernatural nor magical	possessing sound knowledge
(of a musical note) being neither raised nor lowered by one chromatic semitone
being talented through inherited qualities
functioning or occurring in a normal way; lacking abnormalities or deficiencies
unthinking; prompted by (or as if by) instinct
free from artificiality
(used especially of commodities) being unprocessed or manufactured using only simple or minimal processes