Argonauts rhymes with:
argonaut's, argonaut's, argonaut's, argonaut's, astronauts, astronauts', cosmonauts, cosmonauts', argonaut's, astronauts, astronauts', cosmonauts, cosmonauts'
Argonauts sounds like:
aerosmith's, arachnids, archimedes, argonaut's, argument's, arguments, arraignments, arrowsmith's