biology vs natural

biology and natural both are nouns.

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

biology (noun)	natural (noun)
the science that studies living organisms	(craps) a first roll of 7 or 11 that immediately wins the stake
all the plant and animal life of a particular region	a notation cancelling a previous sharp or flat
characteristic life processes and phenomena of living organisms	someone regarded as certain to succeed

biology (adjective)	natural (adjective)
	(of a parent or child) related by blood; genetically related
	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