spontaneous vs natural

spontaneous is not a noun while natural is a noun.

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

spontaneous (noun)	natural (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

spontaneous (adjective)	natural (adjective)
happening or arising without apparent external cause	(of a parent or child) related by blood; genetically related
said or done without having been planned or written in advance	in accordance with nature; relating to or concerning nature
	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