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