placenta vs placental

placenta and placental both are nouns.

Word	Noun	Adjective	Verb	Adverb
placenta	Yes	No	No	No
placental	Yes	Yes	No	No

placenta (noun)	placental (noun)
the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus	mammals having a placenta; all mammals except monotremes and marsupials
that part of the ovary of a flowering plant where the ovules form

placenta (adjective)	placental (adjective)
	pertaining to or having or occurring by means of a placenta