Monsanto's rhymes with:
esperanto's, taranto's, antos, barrientos, contos, delossantos, desantos, dossantos, esperanto's, kontos, mementos, sacramento's, sorento's, taranto's, toronto's
Monsanto's sounds like:
macintax, macintosh, macintosh's, macintoshes, mackintosh, magnates, magnet's, magnetek, magnetic, magnetics, magnets, magnitudes, management's, managements, managements', mankind's, mankinds, massenet's, mccants, mcintosh, mismatch, mismatches