charcoal pile vs cumulus

charcoal pile and cumulus both are nouns.

Word	Noun	Adjective	Verb	Adverb
charcoal pile	Yes	No	No	No
cumulus	Yes	Yes	No	No

As nouns, cumulus is a hypernym of charcoal pile; that is, cumulus is a word with a broader meaning than charcoal pile:

charcoal pile: a pile of wooden billets, covered with turf or moistened clay, used to produce wood charcoal.
cumulus: a collection of objects laid on top of each other

Other hypernyms of charcoal pile include agglomerate, cumulation, heap, mound, pile.

charcoal pile (noun)	cumulus (noun)
a pile of wooden billets, covered with turf or moistened clay, used to produce wood charcoal.	a collection of objects laid on top of each other
	a globular cloud

charcoal pile (adjective)	cumulus (adjective)
	of or related to cumulous clouds