Decompose rhymes with:
compose, compose, superimpose, campeau's, compose, impose, reimpose, superimpose, campeau's, compose, depose, dispose, expose, impose, interpose, juxtapose, oppose, overexpose, poe's, pose, pows, predispose, presuppose, propose, reimpose, repose, superimpose, suppose, transpose
Decompose sounds like:
daughenbaugh, decomposes, deschamps, djukanovic, duchamp's