mesoderm vs mesenchyme

mesoderm and mesenchyme both are nouns.

Word	Noun	Adjective	Verb	Adverb
mesoderm	Yes	No	No	No
mesenchyme	Yes	No	No	No

As nouns, mesenchyme is a hyponym of mesoderm; that is, mesenchyme is a word with a more specific, narrower meaning than mesoderm:

mesoderm: the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue
mesenchyme: mesodermal tissue that forms connective tissue and blood and smooth muscles

Other hyponyms of mesoderm include chordamesoderm, chordomesoderm.

mesoderm (noun)	mesenchyme (noun)
the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue	mesodermal tissue that forms connective tissue and blood and smooth muscles