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