plant material vs husk

plant material and husk both are nouns.

Word	Noun	Adjective	Verb	Adverb
plant material	Yes	No	No	No
husk	Yes	No	Yes	No

As nouns, husk is a hyponym of plant material; that is, husk is a word with a more specific, narrower meaning than plant material:

plant material: material derived from plants
husk: material consisting of seed coverings and small pieces of stem or leaves that have been separated from the seeds

Other hyponyms of plant material include cutin, chaff, shuck, stalk, straw, stubble, cork, plant product, vegetable tallow, wood.

plant material (noun)	husk (noun)
material derived from plants	outer membranous covering of some fruits or seeds
	material consisting of seed coverings and small pieces of stem or leaves that have been separated from the seeds

plant material (verb)	husk (verb)
	remove the husks from