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