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