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