Here's what rhymes with heterocyclic.

Consider these alternatives

bicyclic / epicyclic aromatic / dramatic halogenated / dated aliphatic / dramatic pyridine / line pyrimidine / seen naphthalene / seen amine / mean piperidine / seen unsubstituted / included pyrrole / whole imidazole / holy triazine / seen phenyl / renal fluorinated / stated quinoline / line thiazole / whole unsaturated / dated purine / seen aldehydes / rights pyrrolidine / seen benzene / seen thiophene / seen furan / an terpene / certain