anthracite vs hard coal

anthracite and hard coal both are nouns.

Word	Noun	Adjective	Verb	Adverb
anthracite	Yes	No	No	No
hard coal	Yes	No	No	No

As nouns, anthracite and hard coal are synonyms defined as:

anthracite and hard coal: a hard natural coal that burns slowly and gives intense heat

Other synonyms of anthracite include anthracite coal.

anthracite (noun)	hard coal (noun)
a hard natural coal that burns slowly and gives intense heat	a hard natural coal that burns slowly and gives intense heat