Here's what rhymes with ultramicroscopical.
                        
                        
                    
                                microscopical  tropical  subtropical  semitropical  nontropical  Words that almost rhyme with ultramicroscopical
logical  illogical  zoological  urological  psychological  theological  ecological  prodigal  ethological  biological  pathological  chronological  geological  neurological  periodical  mythological  pedagogical  phonological  analogical  philological  topological  dialogical  ethnological  mineralogical  serological  aetiological  gynaecological  horological  ideological  physiological  technological  archaeological  sociological  morphological  ontological  eschatological  histological  immunological  astrological  etiological  radiological  teleological  typological  archeological  hydrological  gynecological  tautological  ornithological  audiological  musicological  astronautical  speleological  methodological  genealogical  meteorological  pharmacological  microbiological  terminological  embryological  hematological  toxicological  dermatological  haematological  neuropsychological  bacteriological  biotechnological  epidemiological  phenomenological  neurophysiological  psychophysiological  electrophysiological  conical  comical  chronicle  hospital  ironical  dropsical  historical  philosophical  economical  rhetorical  categorical  symbolical  ahistorical  theosophical  metaphorical  diabolical  uneconomical  unhistorical  pocketsful  astronomical  paradoxical  prehistorical  taxonomical  gastronomical