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