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