Astronauts rhymes with:
astronauts', astronauts', astronauts', astronauts', argonaut's, argonauts, astronauts', cosmonauts, cosmonauts', argonaut's, argonauts, astronauts', cosmonauts, cosmonauts'
Astronauts sounds like:
accouterments, accoutrements, astronaut's, astronautic, astronautics, astronauts'