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