globular pearlite vs pearlite

globular pearlite and pearlite both are nouns.

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

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

globular 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

globular 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