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