plastron vs zoology

plastron and zoology both are nouns.

Word	Noun	Adjective	Verb	Adverb
plastron	Yes	No	No	No
zoology	Yes	No	No	No

plastron (noun)	zoology (noun)
(zoology) the part of a turtle's shell forming its underside	the branch of biology that studies animals
a large pad worn by a fencer to protect the chest	all the animal life in a particular region or period
a metal breastplate that was worn under a coat of mail
the front of man's dress shirt
the ornamental front of a woman's bodice or shirt