natural vs biology

natural and biology both are nouns.

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

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

natural (adjective)	biology (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