Humboldt rhymes with:
wambolt, casebolt, deadbolt, godbolt, rainbolt, reinbolt, seabolt, unbolt, wambolt, arnholt, casebolt, counterrevolt, deadbolt, eickholt, godbolt, landolt, loadholt, rainbolt, reinbolt, rockholt, seabolt, unbolt, wambolt, weatherholt