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