iron ore vs taconite

iron ore and taconite both are nouns.

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

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

iron ore: an ore from which iron can be extracted
taconite: a variety of chert containing magnetite and hematite; mined as a low-grade iron ore

iron ore (noun)	taconite (noun)
an ore from which iron can be extracted	a variety of chert containing magnetite and hematite; mined as a low-grade iron ore