germ layer vs exoderm

germ layer and exoderm both are nouns.

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

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

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

germ layer (noun)	exoderm (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