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