Here is a list of 5 syllable words that start with ‘O.’ There is a total of 262 words in these tables. Each table is divided into two columns. The left column contains the five-syllable ‘O’ words, and the right column includes the syllables.
While making this table, we have removed those words that are no longer used in modern literary works. If you see any errors in this list, please let us know.
5 Syllable Words Syllables Obedientiary obe-di-en-tia-ry Oberrealschule ober-re-al-schu-le Obfusticated ob-fus-ti-cat-ed Objectivity ob-jec-tiv-i-ty Obligational ob-li-ga-tion-al Obliterable ob-lit-er-a-ble Oblivionize ob-liv-i-on-ize Obnoxiety ob-nox-i-e-ty Observatories ob-ser-va-to-ry Obsidianite ob-sid-i-an-ite Obsidional ob-sid-i-o-nal Obsidionary ob-sid-i-o-nary Occasionalism oc-ca-sion-al-ism Occasionalist oc-ca-sion-al-ist Occasionally oc-ca-sion-al-ly Occidentalism oc-ci-den-tal-ism Occidentalist oc-ci-den-tal-ist Occidentalize oc-ci-den-tal-ize Occipitomastoid oc-cip-i-to-mastoid Occupational oc-cu-pa-tion-al Ocellocular oc-el-loc-u-lar Ochotonidae och-o-ton-i-dae Octadecanol oc-ta-dec-a-nol Octocorallia oc-to-co-ral-lia Octodecillion oc-to-de-cil-lion Octodecimo oc-to-dec-i-mo Octonocular oc-to-noc-u-lar Octopodidae oc-to-pod-i-dae Octosyllabic oc-to-syl-lab-ic Octosyllable oc-to-syl-la-ble Ocularia oc-u-lar-i-um Oculomotor oc-u-lo-mo-tor Odonatologist odo-na-tol-o-gist Odonatology odo-na-tol-o-gy Odontaspidae odon-tas-pid-i-dae Odontoceridae odon-to-cer-i-dae Oecophoridae oe-co-phor-i-dae Oecumenical oe-cu-men-i-cal Oecussi oe-cus-si-am-be-no Oedemeridae oe-de-mer-i-dae Oedogonium oe-do-go-ni-um Officiales of-fi-ci-a-lis Officialisation of-fi-cial-iza-tion Officiator of-fi-ci-a-tor Ogcocephalus og-co-ceph-a-lus Olacaceae ol-a-ca-ce-ae Oldenbarnevelt ol-den-bar-ne-velt Oleacinidae ole-a-cin-i-dae Oleandomycin ole-an-do-my-cin Oleocelloses ole-o-cel-lo-sis Oleosacchara ole-o-sac-cha-rum Olfactology ol-fac-tol-o-gy Olfactometer ol-fac-tom-e-ter Oligochaeta ol-i-go-chae-ta Oligophagous ol-i-goph-a-gous
5 Syllable Words Syllables Oligopolist ol-i-gop-o-ly Oligopsonist ol-i-gop-so-nist Oligopsonistic ol-i-gop-so-ny Oligotricha ol-i-got-ri-cha Oligotrophic ol-i-go-tro-phic Oligotropic ol-i-go-trop-ic Oligozoic ol-i-go-zo-ic Oliverian ol-i-ve-ri-an Oliviferous ol-i-vif-er-ous Olpidiaster ol-pid-i-as-ter Omissibility omis-si-bil-i-ty Ommatidia om-ma-tid-i-um Omnicompetence om-ni-com-pe-tent Omnifarious om-ni-far-i-ous Omniphibious om-ni-phib-i-ous Omnipotency om-nip-o-ten-cy Omnisexual om-ni-sex-u-al Omoplatoscopy omo-pla-tos-co-py Omphalode om-pha-lo-di-um Omphaloskepsis om-pha-lo-skep-sis Onagraceae on-a-gra-ce-ae Oncogenesis on-co-gen-e-sis Oneirocritical onei-ro-crit-i-cal Oneirocriticism onei-ro-crit-i-cism Onomasticon on-o-mas-ti-con Onomatopoeia on-o-mato-poe-ia Onomatopy on-o-mat-o-py Onosmodium on-os-mo-di-um Ontogenesis on-to-gen-e-sis Ontogenetic on-to-ge-net-ic Ontological on-to-log-i-cal Onychogale on-y-chog-a-le Onychogalea on-y-cho-ga-lea Onychophora on-y-choph-o-ra Onychophoran on-y-choph-o-ran Oocystaceae oo-cys-ta-ce-ae Oophorectomies oo-pho-rec-to-my Oosporiferous oo-spor-if-er-ous Operational op-er-a-tion-al Operationism op-er-a-tion-ism Operosity op-er-os-i-ty Ophicephalidae ophi-ce-phal-i-dae Ophichthyidae oph-ich-thy-i-dae Ophiocephalidae ophio-ce-phal-i-dae Ophioglossaceae ophio-glos-sa-ce-ae Ophiological ophi-o-log-i-cal Ophryoscolecidae ophryo-sco-lec-i-dae Ophthalmiater oph-thal-mi-a-ter Ophthalmologic oph-thal-mol-o-gy Ophthalmologist oph-thal-mol-o-gist Ophthalmometric oph-thal-mo-met-ric Ophthalmosaurus oph-thal-mo-sau-rus Opiliaceae opil-i-a-ce-ae Opisometer op-i-som-e-ter Opisthocoelian opis-tho-coe-li-an
5 Syllable Words Syllables Opisthocomi op-is-thoc-o-mi Opisthocomidae opis-tho-com-i-dae Opisthodomos op-is-thod-o-mos Opisthoglypha op-is-thog-ly-pha Opisthognathidae opis-tho-gnath-i-dae Opisthogoneate opis-tho-go-ne-ate Opisthorchiid op-is-thor-chi-id Oplegnathidae op-leg-nath-i-dae Opportunistic op-por-tu-nis-tic Opportunities op-por-tu-ni-ty Oppositionary op-po-si-tion-ary Oppositionism op-po-si-tion-ism Oppositionist op-po-si-tion-ist Oppositionless op-po-si-tion-less Optimization op-ti-mi-za-tion Optoelectronic op-to-elec-tron-ics Optokinetic op-to-ki-net-ic Oratorial or-a-to-ri-al Oratorian or-a-to-ri-an Oratorical or-a-tor-i-cal Orbitolina or-bi-to-li-na Orbitolites or-bi-to-li-tes Orchesography or-che-sog-ra-phy Orchidaceae or-chi-da-ce-ae Orchidologist or-chid-ol-o-gist Orchidology or-chid-ol-o-gy Orchiectomies or-chi-ec-to-my Ordinariate or-di-nar-i-ate Ordinarily or-di-nar-i-ly Orectolobidae orec-to-lob-i-dae Organization or-ga-ni-za-tion Organochlorine or-gan-o-chlo-rine Organogenist or-ga-nog-e-nist Organoleptic or-gan-o-lep-tic Organophosphate or-gan-o-phos-phate Organoscopy or-ga-nos-co-py Orientality ori-en-tal-i-ty Originality orig-i-nal-i-ty Orismological or-is-mol-o-gy Ornamentalism or-na-men-tal-ism Ornamentalist or-na-men-tal-ist Ornamentation or-na-men-ta-tion Ornithischian or-nith-is-chi-an Ornithocephalus or-nitho-ceph-a-lus Ornithodelphes or-nith-o-del-phes Ornithodorus or-ni-thod-o-rus Ornithogalum or-ni-thog-a-lum Ornithologic or-ni-thol-o-gy Ornithomancy or-nith-o-man-cy Ornithophilous or-ni-thoph-i-lous Ornithopoda or-ni-thop-o-da Ornithopodous or-ni-thop-o-dous Ornithoscopist or-ni-thos-co-pist Ornithoscopy or-ni-thos-co-py Ornithotomical or-nitho-tom-i-cal
5 Syllable Words Syllables Ornithotomist or-ni-thot-o-mist Ornithotomy or-ni-thot-o-my Orobanchaceae oro-ban-cha-ce-ae Orological or-o-log-i-cal Orthoceracone or-tho-cer-a-cone Orthoceratite or-tho-cer-a-tite Orthoceratoid or-tho-cer-a-toid Orthochromatic or-tho-chro-mat-ic Orthodoxical or-tho-dox-i-cal Orthogenesis or-tho-gen-e-sis Orthogonalization or-thog-o-nal-ize Orthomyxovirus or-tho-myxo-vi-rus Orthonectida or-tho-nec-ti-da Orthopteroidea or-thop-ter-oi-dea Oryzivorous or-y-ziv-o-rous Oscillatoria os-cil-la-to-ria Oscinosoma os-cin-o-so-ma Osculometer os-cu-lom-e-ter Osirification osi-ri-fi-ca-tion Osmeteria os-me-te-ri-um Osmiiridium os-mi-rid-i-um Osmolal os-mo-lal-i-ty Osmolar os-mo-lar-i-ty Osmundaceae os-mun-da-ce-ae Osphromenidae os-phro-men-i-dae Ossification os-si-fi-ca-tion Osteichthian os-te-ich-thy-an Osteichthyes os-te-ich-thy-es Ostensoria os-ten-so-ri-um Osteocolla os-te-o-col-la Osteocomma os-te-o-com-ma Osteogenic os-te-o-gen-ic Osteoglossid os-te-o-glos-sid Osteoglossum os-te-o-glos-sum Osteography os-te-og-ra-phy Osteolepid os-te-o-lep-id Osteolepis os-te-ol-e-pis Osteolepoid os-te-ol-e-poid Osteologic os-te-o-log-ic Osteological os-te-ol-o-gy Osteopathic os-te-op-a-thy Osteoplastic os-te-o-plas-ty Osteostracan os-te-os-tra-can Osteostraci os-te-os-tra-ci Ostomatidae os-to-mat-i-dae Ostracodermi os-tra-co-der-mi Ostracophori os-tra-coph-o-ri Ostreophagous os-tre-oph-a-gous Otiorhynchidae oti-o-rhyn-chi-dae Outmanipulate out-ma-nip-u-late Ovariotomies ovar-i-ot-o-my Overaccentuate over-ac-cen-tu-ate Overanimated over-an-i-mat-ed Overapplication over-ap-pli-ca-tion Overarticulate over-ar-tic-u-late
5 Syllable Words Syllables Overburdeningly over-bur-den-ing-ly Overcapacity over-ca-pac-i-ty Overcapitalization over-cap-i-tal-ize Overcommercialization over-com-mer-cial-ize Overcommunicate over-com-mu-ni-cate Overcompensate over-com-pen-sa-tion Overcomplicate over-com-pli-cat-ed Overconcentrated over-con-cen-tra-tion Overconscientious over-con-sci-en-tious Overconservative over-con-ser-va-tive Overcultivation over-cul-ti-va-tion Overdiagnose over-di-ag-no-sis Overeducated over-ed-u-cat-ed Overenergetic over-en-er-get-ic Overenthusiasm over-en-thu-si-asm Overestimation over-es-ti-ma-tion Overexaggerate over-ex-ag-ger-ate Overexpectation over-ex-pec-ta-tion Overextrapolate over-ex-trap-o-late Overextravagant over-ex-trav-a-gant Overexuberant over-ex-u-ber-ant Overfastidious over-fas-tid-i-ous Overgeneralization over-gen-er-al-ize Overhomogenize over-ho-mog-e-nize Overimaginative over-imag-i-na-tive Overindebted over-in-debt-ed-ness Overopinionated over-opin-ion-at-ed Overorchestrated over-or-ches-trat-ed Overparticular over-par-tic-u-lar Overpopulation over-pop-u-la-tion Overrepresentation over-rep-re-sent-ed Oversolicitous over-so-lic-i-tous Overstimulated over-stim-u-lat-ed Ovoviviparous ovo-vi-vip-a-rous Oxidimetry ox-i-dim-e-try Oxidization ox-i-di-za-tion Oxidulated ox-id-u-lat-ed Oxygenator ox-y-gen-a-tor Oxyhemoglobin oxy-he-mo-glo-bin Oxyphenbutazone oxy-phen-bu-ta-zone Oxytetracycline oxy-tet-ra-cy-cline Ozonification ozo-ni-fi-ca-tion
