Here's what rhymes with helical.
angelical evangelical Words that almost rhyme with helical
spherical hysterical hemispherical vesicle vesical heretical technical theoretical lexical poetical metrical unethical testicle hermetical identical symmetrical indelible electrical alphabetical asymmetrical antithetical arithmetical biomedical exegetical nonsensical academical obstetrical parenthetical dialectical geometrical ecumenical nontechnical unsymmetrical diametrical extendible imperceptible petrochemical nonidentical pyrotechnical infinitesimal nonelectrical electrochemical trigonometrical incomprehensible