Feedstocks rhymes with:
detox, aftershocks, audiovox, boombox, boondocks, breadbox, colorocs, crosswalks, deadlocks, detox, equinox, fischbach's, flintlocks, gearbox, gridlock's, gridlocks, gutwaks, hancock's, heterodox, hitchcock's, hollyhocks, icebox, jaycox, jukebox, mailbox, matchbox, matchlocks, orthodox, padlocks, palafox, paradox, peacocks, roadblocks, saltbox, sandbox, shamrock's, sherlock's, simcox, skybox, smallpox, soapbox, spacewalks, tarbox, tinderbox, unorthodox, willcox, woodcox