graphite vs atomic number 6

graphite and atomic number 6 both are nouns.

Word	Noun	Adjective	Verb	Adverb
graphite	Yes	No	No	No
atomic number 6	Yes	No	No	No

As nouns, atomic number 6 is a hypernym of graphite; that is, atomic number 6 is a word with a broader meaning than graphite:

graphite: used as a lubricant and as a moderator in nuclear reactors
atomic number 6: an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds

Other hypernyms of graphite include C, carbon.

graphite (noun)	atomic number 6 (noun)
used as a lubricant and as a moderator in nuclear reactors	an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds