insulant vs corkboard

insulant and corkboard both are nouns.

Word	Noun	Adjective	Verb	Adverb
insulant	Yes	No	No	No
corkboard	Yes	No	No	No

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

insulant: insulating material that reduces or prevents the transmission of heat or sound or electricity
corkboard: a heat-insulating building material consisting of cork granules that are made into sheets by compressing and baking

Other hyponyms of insulant include lagging.

insulant (noun)	corkboard (noun)
insulating material that reduces or prevents the transmission of heat or sound or electricity	a heat-insulating building material consisting of cork granules that are made into sheets by compressing and baking