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