pericarp vs burr

pericarp and burr both are nouns.

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

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

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

pericarp (noun)	burr (noun)
the ripened and variously modified walls of a plant ovary	rough projection left on a workpiece after drilling or cutting
	rotary file for smoothing rough edges left on a workpiece
	small bit used in dentistry or surgery
	seed vessel having hooks or prickles

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