Circadian rhymes with:
akkadian, arcadian, akkadian, arcadian, canadian, chadian, mooradian, mouradian, pancanadian, accordion, akkadian, amerindian, andean, antemeridian, arcadian, burgundian, cambodian, canadian, ceridian, chadian, claudian, collodion, comedian, custodian, davidian, didion, edwardian, floridian, freudian, garabedian, gedeon, gideon, gordian, guardian, indian, macfadyen, madyun, mcfadyen, median, meridian, meridien, mooradian, mouradian, nalbandian, nickelodeon, obsidian, odeon, odiaun, pancanadian, providian
Circadian sounds like:
carsten, cherrystone, chrestman, christen, christiaan, christian, christiana, christiane, christianna, christianne, christiano, christina, christine, christman, christmann, christon, correction, crackdown, creighton, crichton, crisostomo, cristiani, cristiano, cristina, crookston, crosstown, croston, croxton