blastular vs blastula

blastular is not a noun while blastula is a noun.

Word	Noun	Adjective	Verb	Adverb
blastular	No	Yes	No	No
blastula	Yes	No	No	No

blastular (noun)	blastula (noun)
	early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs

blastular (adjective)	blastula (adjective)
of or relating to a blastula