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