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