Undertow rhymes with:
aburto, akihito, appetito, barstow, bartow, cervesato, cristo, divertimento, falsetto, gilberto, grotto, gusto, hirohito, humberto, huto, lamberto, legato, lotto, manifesto, mistletoe, murto, norberto, ostinato, otto, photo, pinto, potato, potatoe, presto, puerto, punto, saito, shinto, staccato, steptoe, stretto, swatow, tiptoe, tomato, umberto
Undertow sounds like:
underrate, underrated, underwood, underwrite, underwrote, undeterred, unhindered, unitrode, untoward, untreated, untried, untruth