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