Castigate rhymes with:
instigate, investigate, instigate, investigate, mitigate, abrogate, congregate, corrugate, delegate, desegregate, fumigate, instigate, interrogate, investigate, irrigate, koreagate, mitigate, navigate, obligate, propagate, relegate, segregate, subjugate
Castigate sounds like:
castigated, chastised, chatswood, chitchat, cityside, cutest