pericarp vs bur

pericarp and bur both are nouns.

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

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

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

pericarp (noun)	bur (noun)
the ripened and variously modified walls of a plant ovary	small bit used in dentistry or surgery
	seed vessel having hooks or prickles

pericarp (verb)	bur (verb)
	remove the burrs from