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