pericarp vs endocarp

pericarp and endocarp both are nouns.

Word	Noun	Adjective	Verb	Adverb
pericarp	Yes	No	No	No
endocarp	Yes	No	No	No

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

pericarp: the ripened and variously modified walls of a plant ovary
endocarp: the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed

Other hyponyms of pericarp include epicarp, exocarp, mesocarp, pit, stone, capsule, bur, burr.

pericarp (noun)	endocarp (noun)
the ripened and variously modified walls of a plant ovary	the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed