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