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