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