compost heap vs cumulation

compost heap and cumulation both are nouns.

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

As nouns, cumulation is a hypernym of compost heap; that is, cumulation 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
cumulation: a collection of objects laid on top of each other

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

compost heap (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