endocarp vs pericarp

endocarp and pericarp both are nouns.

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

As nouns, pericarp is a hypernym of endocarp; that is, pericarp is a word with a broader meaning than endocarp:

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
pericarp: the ripened and variously modified walls of a plant ovary

Other hypernyms of endocarp include seed vessel.

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