iron ore vs hematite

iron ore and hematite both are nouns.

Word	Noun	Adjective	Verb	Adverb
iron ore	Yes	No	No	No
hematite	Yes	No	No	No

As nouns, hematite is a hyponym of iron ore; that is, hematite is a word with a more specific, narrower meaning than iron ore:

iron ore: an ore from which iron can be extracted
hematite: the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form

iron ore (noun)	hematite (noun)
an ore from which iron can be extracted	the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form