Antiquate rhymes with:
actuate, braithwaite, counterweight, cowperthwaite, deadweight, featherweight, fluctuate, garthwaite, goldthwaite, heavyweight, hundredweight, menstruate, middleweight, paperweight, perpetuate, underweight, welterweight
Antiquate sounds like:
amethyst, amidst, andesite, antacid, antiquated, antiquity