compost pile vs cumulation

compost pile and cumulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
compost pile	Yes	No	No	No
cumulation	Yes	No	No	No

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

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

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

compost pile (noun)	cumulation (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