Here's what rhymes with onomatic.
automatic pneumatic asthmatic fanatic dramatic static hepatic aromatic dogmatic emphatic somatic thematic erratic rheumatic cinematic kinematic magmatic spermatic climatic pragmatic schematic traumatic autocratic enigmatic enzymatic lymphatic aliphatic axiomatic chromatic emblematic operatic achromatic idiomatic acrobatic thermostatic undramatic nondramatic unemphatic aerobatic democratic diplomatic systematic problematic pancreatic symptomatic ecstatic metastatic monochromatic prismatic programmatic muriatic phlegmatic theocratic zygomatic schismatic astigmatic numismatic panchromatic stigmatic asymptomatic charismatic prostatic melodramatic psychosomatic diagrammatic intrahepatic orthostatic technocratic undemocratic unsystematic antidemocratic epigrammatic semiautomatic undiplomatic unidiomatic aristocratic bureaucratic paradigmatic diaphragmatic homeostatic unproblematic nondemocratic plutocratic photostatic homoeostatic hydrostatic posttraumatic meritocratic idiosyncratic electrostatic Words that almost rhyme with onomatic
magic nomadic tragic pelagic syllabic sporadic apparatchik priapic monosyllabic disyllabic polysyllabic monastic manic mastic metallic panic lactic mechanic tactic phallic tannic malefic dynamic traffic classic elastic plastic romantic fabric fantastic gastric graphic semantic ceramic drastic frantic catholic dynastic inelastic synaptic galactic panoramic pedantic spastic aplastic clastic italic satanic bombastic botanic tyrannic matchstick nonelastic organic gigantic scholastic thoracic volcanic barbaric didactic hemorrhagic neoplastic oceanic sarcastic thermodynamic cephalic climactic galvanic messianic ophthalmic thalamic tympanic anaphylactic gymnastic haemorrhagic thermoplastic titanic bimetallic nonmetallic orgiastic slapstick unromantic ataxic baldric demographic geographic psychiatric inorganic ethnographic pediatric stochastic geriatric glutamic nostalgic pornographic presynaptic topographic heraldic holographic psychopathic isobaric paediatric biographic calligraphic neoclassic osteopathic periphrastic sycophantic phonographic enthusiastic photographic prophylactic aerodynamic hemodynamic telegraphic transatlantic angiographic cartographic hyperplastic hypoplastic iconoclastic iconographic lithographic orthographic splanchnic tomographic oceanographic stenographic typographic anticlimactic choreographic intergalactic cytoplasmic hypothalamic ecclesiastic endoplasmic postsynaptic psychodynamic stratigraphic intrathoracic viscoelastic chiropractic unenthusiastic autobiographic interscholastic transoceanic xerographic seismographic radiographic chromatographic hydrodynamic overenthusiastic bibliographic protoplasmic cinematographic crystallographic lexicographic electrocardiographic electroencephalographic