Sputnik rhymes with:
hutnick, sutnick, bartnick, bartnik, beatnik, blatnik, blotnick, bortnick, hutnick, mitnick, plotnick, slotnick, subotnick, sutnick, zlotnick
Sputnik sounds like:
septimus, shafting, shifting, sifting, softening, softens, softimage, softness, speeding, spitting, spotting, spouting, sputniks, subatomic, subduing, subotnick, swiftness