Here's what rhymes with polynaphthenic.
phrenic splenic irenic callisthenic pathogenic eugenic neurasthenic allergenic calisthenic antigenic schizophrenic transgenic biogenic psychogenic pyogenic photogenic telegenic cryogenic mutagenic neurogenic teratogenic androgenic hypoallergenic carcinogenic anthropogenic iatrogenic hallucinogenic Words that almost rhyme with polynaphthenic
pfennig systemic ischemic academic epidemic endemic epistemic polemic pandemic totemic leukaemic nonacademic ferric fetich aesthetic authentic acetic athletic ascetic esthetic forensic relic septic centric hectic technic benthic sceptic steric derrick medic poetic synthetic anesthetic metric pathetic pelvic angelic phonetic anaesthetic apathetic aseptic cleric peptic allelic emetic eutectic skeptic hermetic hysteric inauthentic acerbic lovesick pectic unaesthetic unauthentic bathetic magnetic genetic arithmetic atmospheric energetic generic kinetic prophetic eccentric symmetric cosmetic esoteric numeric alphabetic enteric prosthetic empathetic frenetic isomeric kinesthetic tartaric turmeric anorexic chimeric ionospheric anorectic antithetic polytechnic gametic redbrick exegetic unesthetic phrenetic domestic electric sympathetic diabetic majestic antiseptic asymmetric concentric eclectic epileptic diuretic isometric obstetric cybernetic egocentric ethnocentric monomeric paramagnetic psychedelic dietetic dyslexic dyspeptic geocentric geodesic geodetic evangelic homiletic paramedic splenetic paregoric parenthetic nonathletic copacetic dyslectic dialectic dielectric geometric apologetic mesenteric parametric econometric psychometric barometric biosynthetic geomagnetic ontogenetic photometric alphanumeric apoplectic heliocentric peripatetic antipathetic cataleptic nonmagnetic paraplegic pyrotechnic thermometric diametric telekinetic volumetric parasympathetic photosynthetic phylogenetic unsympathetic colorimetric ferromagnetic isoelectric neuroleptic anthropocentric radiometric unapologetic narcoleptic psychokinetic cliometric photoelectric antidiuretic nonparametric onomatopoetic nonelectric electromagnetic hydroelectric pharmacokinetic piezoelectric stoichiometric trigonometric