natural vs spontaneous

natural is a noun but spontaneous is not a noun.

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

natural (noun)	spontaneous (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)	spontaneous (adjective)
(of a parent or child) related by blood; genetically related	happening or arising without apparent external cause
in accordance with nature; relating to or concerning nature	said or done without having been planned or written in advance
existing in or produced by nature; not artificial or imitation
existing in or in conformity with nature or the observable world; neither supernatural nor magical
(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