seed vessel vs burr

seed vessel and burr both are nouns.

Word	Noun	Adjective	Verb	Adverb
seed vessel	Yes	No	No	No
burr	Yes	No	Yes	No

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

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

seed vessel (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

seed vessel (verb)	burr (verb)
	remove the burrs from