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