iron carbide vs cementite

iron carbide and cementite both are nouns.

Word	Noun	Adjective	Verb	Adverb
iron carbide	Yes	No	No	No
cementite	Yes	No	No	No

As nouns, iron carbide and cementite are synonyms defined as:

iron carbide and cementite: a chemical compound that is a constituent of steel and cast iron; very hard and brittle

iron carbide (noun)	cementite (noun)
a chemical compound that is a constituent of steel and cast iron; very hard and brittle	a chemical compound that is a constituent of steel and cast iron; very hard and brittle