humate vs wood coal

humate and wood coal both are nouns.

Word	Noun	Adjective	Verb	Adverb
humate	Yes	No	No	No
wood coal	Yes	No	No	No

As nouns, wood coal is a hyponym of humate; that is, wood coal is a word with a more specific, narrower meaning than humate:

Other hyponyms of humate include peat, brown coal, lignite, humic shale.

humate (noun)	wood coal (noun)
material that is high in humic acids	intermediate between peat and bituminous coal
	a carbonaceous material obtained by heating wood or other organic matter in the absence of air