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