germ layer vs ectoblast

germ layer and ectoblast both are nouns.

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

As nouns, ectoblast is a hyponym of germ layer; that is, ectoblast 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
ectoblast: the outer germ layer that develops into skin and nervous tissue

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

germ layer (noun)	ectoblast (noun)
(embryology) any of the 3 layers of cells differentiated in embryos following gastrulation	the outer germ layer that develops into skin and nervous tissue