iron ore vs haematite

iron ore and haematite both are nouns.

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

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

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

iron ore (noun)	haematite (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