granular pearlite vs pearlite

granular pearlite and pearlite both are nouns.

Word	Noun	Adjective	Verb	Adverb
granular pearlite	Yes	No	No	No
pearlite	Yes	No	No	No

As nouns, pearlite is a hypernym of granular pearlite; that is, pearlite is a word with a broader meaning than granular pearlite:

granular pearlite: if steel or iron cool very slowly the cementite may occur in globules instead of in layers
pearlite: a lamellar mixture of cementite and ferrite formed during the cooling of austenite; a constituent of steel and cast iron

granular pearlite (noun)	pearlite (noun)
if steel or iron cool very slowly the cementite may occur in globules instead of in layers	a lamellar mixture of cementite and ferrite formed during the cooling of austenite; a constituent of steel and cast iron