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