germ layer vs hypoblast

germ layer and hypoblast both are nouns.

Word	Noun	Adjective	Verb	Adverb
germ layer	Yes	No	No	No
hypoblast	Yes	No	No	No

As nouns, hypoblast is a hyponym of germ layer; that is, hypoblast is a word with a more specific, narrower meaning than germ layer:

germ layer: (embryology) any of the 3 layers of cells differentiated in embryos following gastrulation
hypoblast: the inner germ layer that develops into the lining of the digestive and respiratory systems

Other hyponyms of germ layer include ectoblast, ectoderm, exoderm, mesoblast, mesoderm, endoblast, endoderm, entoblast, entoderm.

germ layer (noun)	hypoblast (noun)
(embryology) any of the 3 layers of cells differentiated in embryos following gastrulation	the inner germ layer that develops into the lining of the digestive and respiratory systems