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