stool vs meconium

stool and meconium both are nouns.

Word	Noun	Adjective	Verb	Adverb
stool	Yes	No	Yes	No
meconium	Yes	No	No	No

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

stool: solid excretory product evacuated from the bowels
meconium: thick dark green mucoid material that is the first feces of a newborn child

Other hyponyms of stool include dog do, dog shit, dog turd, doggy do, crap, dirt, poop, shit, shite, turd, droppings, dung, muck, melaena, melena.

stool (noun)	meconium (noun)
a simple seat without a back or arms	thick dark green mucoid material that is the first feces of a newborn child
a plumbing fixture for defecation and urination
(forestry) the stump of a tree that has been felled or headed for the production of saplings
solid excretory product evacuated from the bowels

stool (verb)	meconium (verb)
have a bowel movement
grow shoots in the form of stools or tillers
react to a decoy, of wildfowl
lure with a stool, as of wild fowl