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