Here's what rhymes with thermosyphonic.
sonic phonic ionic ironic tonic iconic conic chronic isotonic symphonic subsonic bionic avionic harmonic chorionic colonic demonic mnemonic sardonic supersonic hypertonic laconic diatonic daemonic monophonic acetonic hegemonic tectonic ultrasonic diachronic histrionic monotonic platonic polyphonic synchronic telephonic hydroponic infrasonic embryonic ganglionic catatonic stereophonic philharmonic electronic pathognomonic planktonic quadraphonic quadrophonic architectonic microelectronic Words that almost rhyme with thermosyphonic
comic atomic autonomic genomic diatomic economic anatomic ergonomic subatomic taxonomic uneconomic agronomic astronomic gastronomic tragicomic socioeconomic macroeconomic microeconomic 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 neurologic ascorbic hyperbolic idiotic metaphoric morphologic psychologic semiotic spasmodic synoptic anarchic anoxic basaltic cathartic cytologic dialogic lethargic orthodontic robotic sclerotic diabolic folkloric xenophobic rhapsodic sophomoric chopstick shambolic seismologic shopaholic placekick alcoholic metabolic periodic antibiotic apostolic physiologic cytotoxic geologic histologic narcotic pathologic anisotropic carbolic endoscopic necrotic symbiotic yardstick agnostic meteoric oligarchic psychotropic quixotic thrombotic arthroscopic bucolic homoerotic vitriolic acrostic ecologic gyroscopic misanthropic subarctic workaholic allegoric subtropic aetiologic chocoholic chocaholic horologic diagnostic microscopic patriotic hydrochloric prehistoric catastrophic macroscopic philanthropic atherosclerotic etiologic metamorphic parabolic pharmacologic hematologic melancholic nontoxic pedagogic telescopic antarctic demagogic fluoroscopic antispasmodic nonalcoholic stroboscopic macrobiotic posthypnotic nonnarcotic haematologic noncaloric astronautic prognostic immunologic gynecologic peristaltic polymorphic stereoscopic kaleidoscopic microcosmic unpatriotic meteorologic gynaecologic anthropomorphic spectroscopic submicroscopic bacteriologic electroscopic epidemiologic