Rundown rhymes with:
sundown, sundown, turndown, ashdown, blastdown, breakdown, clampdown, closedown, comedown, countdown, crackdown, drawdown, godown, hillsdown, hoedown, knockdown, lansdowne, letdown, lockdown, lowdown, markdown, meltdown, piltdown, putdown, shakedown, shootdown, showdown, shutdown, slowdown, southdown, sundown, touchdown, turndown, underdown, writedown
Rundown sounds like:
ramadan, ramtane, ramthun, random, remediation, rendina, rendition, rendon, renomination, renton, rondon, rondonia, rumination, run-down, rwandan, ryanodine