compost heap vs agglomerate

compost heap and agglomerate both are nouns.

Word	Noun	Adjective	Verb	Adverb
compost heap	Yes	No	No	No
agglomerate	Yes	Yes	Yes	No

As nouns, agglomerate is a hypernym of compost heap; that is, agglomerate is a word with a broader meaning than compost heap:

compost heap: a heap of manure and vegetation and other organic residues that are decaying to become compost
agglomerate: a collection of objects laid on top of each other

Other hypernyms of compost heap include cumulation, cumulus, heap, mound, pile.

compost heap (noun)	agglomerate (noun)
a heap of manure and vegetation and other organic residues that are decaying to become compost	a collection of objects laid on top of each other
	volcanic rock consisting of large fragments fused together

compost heap (adjective)	agglomerate (adjective)
	clustered together but not coherent

compost heap (verb)	agglomerate (verb)
	form into one cluster