Here's what rhymes with postganglionic.
chorionic ganglionic ionic tonic sonic conic phonic bionic chronic embryonic ironic colonic iconic laconic daemonic avionic harmonic demonic mnemonic sardonic planktonic platonic hegemonic tectonic ultrasonic diachronic histrionic isotonic monotonic polyphonic symphonic synchronic catatonic diatonic subsonic telephonic monophonic infrasonic acetonic electronic supersonic hypertonic hydroponic stereophonic quadraphonic quadrophonic pathognomonic architectonic philharmonic microelectronic Words that almost rhyme with postganglionic
comic atomic genomic economic anatomic agronomic ergonomic autonomic diatomic uneconomic astronomic taxonomic gastronomic subatomic tragicomic macroeconomic microeconomic socioeconomic logic topic folic gothic boric iambic hayrick rollick cosmic periodic toxic aortic chaotic erotic garlic caloric caustic narcotic carbolic idiotic tropic atopic biotic cathodic euphoric formic frolic gnostic karmic meiotic meteoric myopic robotic sclerotic bardic cirrhotic seraphic carsick alcoholic patriotic antibiotic aquatic exotic neurotic geologic melodic neurologic psychotic necrotic phenolic pyloric semiotic anabolic anarchic anoxic cathartic lethargic nephrotic prosodic bucolic vitriolic ecologic heartsick rhapsodic strophic allegoric subtopic theosophic chopstick nonnarcotic gynaecologic placekick historic symbolic metabolic microscopic hydraulic philosophic biologic despotic episodic hypnotic macroscopic systolic ascorbic etiologic isotopic metaphoric morphologic parabolic psychologic symbiotic synoptic yardstick agnostic basaltic catabolic gynecologic melancholic nontoxic oligarchic orthodontic polymorphic quixotic thrombotic diabolic folkloric hierarchic microcosmic unpatriotic acrostic workaholic macrobiotic aetiologic noncaloric shambolic chocoholic astronautic chocaholic horologic apostolic physiologic prehistoric catastrophic diastolic isotropic pathologic prognostic anisotropic atherosclerotic endoscopic hyperbolic metamorphic pharmacologic spasmodic pedagogic psychotropic telescopic antarctic arthroscopic demagogic homoerotic xenophobic gyroscopic nonalcoholic subarctic sophomoric subtropic shopaholic diagnostic hydrochloric cytotoxic histologic philanthropic anthropomorphic immunologic spectroscopic hematologic peristaltic stereoscopic bacteriologic fluoroscopic kaleidoscopic misanthropic stroboscopic posthypnotic meteorologic haematologic seismologic epidemiologic antispasmodic submicroscopic electroscopic