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