Cosmonauts rhymes with:
cosmonauts', cosmonauts', cosmonauts', cosmonauts', argonaut's, argonauts, astronauts, astronauts', cosmonauts', argonaut's, argonauts, astronauts, astronauts', cosmonauts'
Cosmonauts sounds like:
camdessus, canada's, canandaigua, candace, candice, candice's, candidacies, candidacy, candidate's, candidates, candidates', candies, candiotti's, candy's, cementos, cendejas, cenith's, centex, cents, chants, checkmates, chenowitz, chintzy, ciments, cindy's, cinematic, cocoanuts, coconuts, cognetics, comatose, comdex, comdisco, comedic, comedies, comedy's, comet's, comets, comitatus, command's, commandos, commands, commends, comments, commits, committee's, committees, committees', commodious, commodities, commodity's, communities, community's, commutes, comtois, condos, conduits, coneheads, connotes, contac, contagious, contiguous, contois, contos, coontz, cosmetic, cosmetics, cosmonauts', countess, countesses, counties, counts, county's, cyanamid's, cynthia's