plastron vs zoological science

plastron and zoological science both are nouns.

Word	Noun	Adjective	Verb	Adverb
plastron	Yes	No	No	No
zoological science	Yes	No	No	No

plastron (noun)	zoological science (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
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