turtle vs plastron

turtle and plastron both are nouns.

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

turtle (noun)	plastron (noun)
any of various aquatic and land reptiles having a bony shell and flipper-like limbs for swimming	(zoology) the part of a turtle's shell forming its underside
a sweater or jersey with a high close-fitting collar	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

turtle (verb)	plastron (verb)
hunt for turtles, especially as an occupation
overturn accidentally