/ Thesaurus / C Synonyms of compost heap Find synonyms for: Noun1. compost heap, compost pile, pile, heap, mound, agglomerate, cumulation, cumulususage: a heap of manure and vegetation and other organic residues that are decaying to become compostWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language