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