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