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