Impedes rhymes with:
goodspeed's, speeds, accedes, aidid's, aristede's, aristide's, beads, bleeds, breed's, breeds, cedes, concedes, creeds, deeds, eades, eads, eads', edes, exceeds, feeds, freed's, goodspeed's, heeds, leads, leeds, mead's, meads, medes, misdeeds, misleads, needs, pleads, precedes, preceeds, proceeds, read's, reads, recedes, reed's, reeds, reid's, seed's, seeds, speeds, steed's, steeds, succeeds, supersedes, swedes, weeds
Impedes sounds like:
imbeds, impetuous, impetus, infatuates, infotech, inhabits, inhibits, innovates, inputs, invades, invidious, invitees, invites