coal vs furnish

coal is a noun but furnish is not a noun.

Word	Noun	Adjective	Verb	Adverb
coal	Yes	No	Yes	No
furnish	No	No	Yes	No

As verbs, furnish is a hypernym of coal; that is, furnish is a word with a broader meaning than coal:

Other hypernyms of coal include offer, provide, render, supply.

coal (noun)	furnish (noun)
a hot fragment of wood or coal that is left from a fire and is glowing or smoldering
fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period

coal (verb)	furnish (verb)
take in coal	give something useful or necessary to
supply with coal	provide or equip with furniture
burn to charcoal