Blastular and Blastosphere

Blastular adjective - Of or relating to a blastula.

Blastosphere and blastular are semantically related. In some cases you can use "Blastosphere" instead a noun "Blastular".

Blastosphere 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 and blastosphere are semantically related. Sometimes you can replace term "Blastular" with "Blastosphere", this nouns are similar.