embryonal vs embryo

embryonal is not a noun while embryo is a noun.

Word	Noun	Adjective	Verb	Adverb
embryonal	No	Yes	No	No
embryo	Yes	No	No	No

embryonal (noun)	embryo (noun)
	an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life
	(botany) a minute rudimentary plant contained within a seed or an archegonium

embryonal (adjective)	embryo (adjective)
of an organism prior to birth or hatching