Henceforth rhymes with:
dansforth, thenceforth, dansforth, thenceforth, dansforth, forth, fourth, goforth, thenceforth, borth, dansforth, forth, fourth, goforth, korth, north, orth, porth, thenceforth, warth
Henceforth sounds like:
hansford, hummingbird, hyannisport