pericarp vs mesocarp

pericarp and mesocarp both are nouns.

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

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

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

pericarp (noun)	mesocarp (noun)
the ripened and variously modified walls of a plant ovary	the middle layer of a pericarp