Here's what rhymes with ontological.
logical biological geological illogical analogical dialogical ideological theological ecological pathological neurological mythological astrological topological typological zoological dermatological urological psychological technological archaeological chronological methodological morphological pedagogical phonological etiological radiological archeological mineralogical hematological tautological ethological gynaecological haematological audiological horological physiological sociological eschatological genealogical histological immunological meteorological pharmacological philological ethnological hydrological terminological aetiological embryological gynecological neuropsychological toxicological epidemiological phenomenological bacteriological microbiological biotechnological musicological neurophysiological psychophysiological electrophysiological Words that almost rhyme with ontological
tropical periodical prodigal nontropical subtropical astronautical semitropical microscopical conical chronicle comical ironical diabolical dropsical hospital economical astronomical categorical philosophical paradoxical symbolical uneconomical theosophical taxonomical pocketsful gastronomical