Subatomic rhymes with:
atomic, diatomic, monatomic, atomic, diatomic, monatomic, tomich, adamec, adamik, atomic, autonomic, comic, diatomic, economic, ergonomic, gastronomic, islamic, macroeconomic, microeconomic, monatomic, noneconomic, romick, socioeconomic, technomic, tomich, tragicomic, uneconomic
Subatomic sounds like:
septimus, shafting, shifting, sifting, softening, softens, softimage, softness, speeding, spitting, spotting, spouting, sputnik, sputniks, subduing, subotnick, swiftness