List of 5 Syllable Words Starting With ‘O’

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 WordsSyllables
Obedientiaryobe-di-en-tia-ry
Oberrealschuleober-re-al-schu-le
Obfusticatedob-fus-ti-cat-ed
Objectivityob-jec-tiv-i-ty
Obligationalob-li-ga-tion-al
Obliterableob-lit-er-a-ble
Oblivionizeob-liv-i-on-ize
Obnoxietyob-nox-i-e-ty
Observatoriesob-ser-va-to-ry
Obsidianiteob-sid-i-an-ite
Obsidionalob-sid-i-o-nal
Obsidionaryob-sid-i-o-nary
Occasionalismoc-ca-sion-al-ism
Occasionalistoc-ca-sion-al-ist
Occasionallyoc-ca-sion-al-ly
Occidentalismoc-ci-den-tal-ism
Occidentalistoc-ci-den-tal-ist
Occidentalizeoc-ci-den-tal-ize
Occipitomastoidoc-cip-i-to-mastoid
Occupationaloc-cu-pa-tion-al
Ocellocularoc-el-loc-u-lar
Ochotonidaeoch-o-ton-i-dae
Octadecanoloc-ta-dec-a-nol
Octocoralliaoc-to-co-ral-lia
Octodecillionoc-to-de-cil-lion
Octodecimooc-to-dec-i-mo
Octonocularoc-to-noc-u-lar
Octopodidaeoc-to-pod-i-dae
Octosyllabicoc-to-syl-lab-ic
Octosyllableoc-to-syl-la-ble
Oculariaoc-u-lar-i-um
Oculomotoroc-u-lo-mo-tor
Odonatologistodo-na-tol-o-gist
Odonatologyodo-na-tol-o-gy
Odontaspidaeodon-tas-pid-i-dae
Odontoceridaeodon-to-cer-i-dae
Oecophoridaeoe-co-phor-i-dae
Oecumenicaloe-cu-men-i-cal
Oecussioe-cus-si-am-be-no
Oedemeridaeoe-de-mer-i-dae
Oedogoniumoe-do-go-ni-um
Officialesof-fi-ci-a-lis
Officialisationof-fi-cial-iza-tion
Officiatorof-fi-ci-a-tor
Ogcocephalusog-co-ceph-a-lus
Olacaceaeol-a-ca-ce-ae
Oldenbarneveltol-den-bar-ne-velt
Oleacinidaeole-a-cin-i-dae
Oleandomycinole-an-do-my-cin
Oleocellosesole-o-cel-lo-sis
Oleosaccharaole-o-sac-cha-rum
Olfactologyol-fac-tol-o-gy
Olfactometerol-fac-tom-e-ter
Oligochaetaol-i-go-chae-ta
Oligophagousol-i-goph-a-gous
5 Syllable WordsSyllables
Oligopolistol-i-gop-o-ly
Oligopsonistol-i-gop-so-nist
Oligopsonisticol-i-gop-so-ny
Oligotrichaol-i-got-ri-cha
Oligotrophicol-i-go-tro-phic
Oligotropicol-i-go-trop-ic
Oligozoicol-i-go-zo-ic
Oliverianol-i-ve-ri-an
Oliviferousol-i-vif-er-ous
Olpidiasterol-pid-i-as-ter
Omissibilityomis-si-bil-i-ty
Ommatidiaom-ma-tid-i-um
Omnicompetenceom-ni-com-pe-tent
Omnifariousom-ni-far-i-ous
Omniphibiousom-ni-phib-i-ous
Omnipotencyom-nip-o-ten-cy
Omnisexualom-ni-sex-u-al
Omoplatoscopyomo-pla-tos-co-py
Omphalodeom-pha-lo-di-um
Omphaloskepsisom-pha-lo-skep-sis
Onagraceaeon-a-gra-ce-ae
Oncogenesison-co-gen-e-sis
Oneirocriticalonei-ro-crit-i-cal
Oneirocriticismonei-ro-crit-i-cism
Onomasticonon-o-mas-ti-con
Onomatopoeiaon-o-mato-poe-ia
Onomatopyon-o-mat-o-py
Onosmodiumon-os-mo-di-um
Ontogenesison-to-gen-e-sis
Ontogeneticon-to-ge-net-ic
Ontologicalon-to-log-i-cal
Onychogaleon-y-chog-a-le
Onychogaleaon-y-cho-ga-lea
Onychophoraon-y-choph-o-ra
Onychophoranon-y-choph-o-ran
Oocystaceaeoo-cys-ta-ce-ae
Oophorectomiesoo-pho-rec-to-my
Oosporiferousoo-spor-if-er-ous
Operationalop-er-a-tion-al
Operationismop-er-a-tion-ism
Operosityop-er-os-i-ty
Ophicephalidaeophi-ce-phal-i-dae
Ophichthyidaeoph-ich-thy-i-dae
Ophiocephalidaeophio-ce-phal-i-dae
Ophioglossaceaeophio-glos-sa-ce-ae
Ophiologicalophi-o-log-i-cal
Ophryoscolecidaeophryo-sco-lec-i-dae
Ophthalmiateroph-thal-mi-a-ter
Ophthalmologicoph-thal-mol-o-gy
Ophthalmologistoph-thal-mol-o-gist
Ophthalmometricoph-thal-mo-met-ric
Ophthalmosaurusoph-thal-mo-sau-rus
Opiliaceaeopil-i-a-ce-ae
Opisometerop-i-som-e-ter
Opisthocoelianopis-tho-coe-li-an
5 Syllable WordsSyllables
Opisthocomiop-is-thoc-o-mi
Opisthocomidaeopis-tho-com-i-dae
Opisthodomosop-is-thod-o-mos
Opisthoglyphaop-is-thog-ly-pha
Opisthognathidaeopis-tho-gnath-i-dae
Opisthogoneateopis-tho-go-ne-ate
Opisthorchiidop-is-thor-chi-id
Oplegnathidaeop-leg-nath-i-dae
Opportunisticop-por-tu-nis-tic
Opportunitiesop-por-tu-ni-ty
Oppositionaryop-po-si-tion-ary
Oppositionismop-po-si-tion-ism
Oppositionistop-po-si-tion-ist
Oppositionlessop-po-si-tion-less
Optimizationop-ti-mi-za-tion
Optoelectronicop-to-elec-tron-ics
Optokineticop-to-ki-net-ic
Oratorialor-a-to-ri-al
Oratorianor-a-to-ri-an
Oratoricalor-a-tor-i-cal
Orbitolinaor-bi-to-li-na
Orbitolitesor-bi-to-li-tes
Orchesographyor-che-sog-ra-phy
Orchidaceaeor-chi-da-ce-ae
Orchidologistor-chid-ol-o-gist
Orchidologyor-chid-ol-o-gy
Orchiectomiesor-chi-ec-to-my
Ordinariateor-di-nar-i-ate
Ordinarilyor-di-nar-i-ly
Orectolobidaeorec-to-lob-i-dae
Organizationor-ga-ni-za-tion
Organochlorineor-gan-o-chlo-rine
Organogenistor-ga-nog-e-nist
Organolepticor-gan-o-lep-tic
Organophosphateor-gan-o-phos-phate
Organoscopyor-ga-nos-co-py
Orientalityori-en-tal-i-ty
Originalityorig-i-nal-i-ty
Orismologicalor-is-mol-o-gy
Ornamentalismor-na-men-tal-ism
Ornamentalistor-na-men-tal-ist
Ornamentationor-na-men-ta-tion
Ornithischianor-nith-is-chi-an
Ornithocephalusor-nitho-ceph-a-lus
Ornithodelphesor-nith-o-del-phes
Ornithodorusor-ni-thod-o-rus
Ornithogalumor-ni-thog-a-lum
Ornithologicor-ni-thol-o-gy
Ornithomancyor-nith-o-man-cy
Ornithophilousor-ni-thoph-i-lous
Ornithopodaor-ni-thop-o-da
Ornithopodousor-ni-thop-o-dous
Ornithoscopistor-ni-thos-co-pist
Ornithoscopyor-ni-thos-co-py
Ornithotomicalor-nitho-tom-i-cal
5 Syllable WordsSyllables
Ornithotomistor-ni-thot-o-mist
Ornithotomyor-ni-thot-o-my
Orobanchaceaeoro-ban-cha-ce-ae
Orologicalor-o-log-i-cal
Orthoceraconeor-tho-cer-a-cone
Orthoceratiteor-tho-cer-a-tite
Orthoceratoidor-tho-cer-a-toid
Orthochromaticor-tho-chro-mat-ic
Orthodoxicalor-tho-dox-i-cal
Orthogenesisor-tho-gen-e-sis
Orthogonalizationor-thog-o-nal-ize
Orthomyxovirusor-tho-myxo-vi-rus
Orthonectidaor-tho-nec-ti-da
Orthopteroideaor-thop-ter-oi-dea
Oryzivorousor-y-ziv-o-rous
Oscillatoriaos-cil-la-to-ria
Oscinosomaos-cin-o-so-ma
Osculometeros-cu-lom-e-ter
Osirificationosi-ri-fi-ca-tion
Osmeteriaos-me-te-ri-um
Osmiiridiumos-mi-rid-i-um
Osmolalos-mo-lal-i-ty
Osmolaros-mo-lar-i-ty
Osmundaceaeos-mun-da-ce-ae
Osphromenidaeos-phro-men-i-dae
Ossificationos-si-fi-ca-tion
Osteichthianos-te-ich-thy-an
Osteichthyesos-te-ich-thy-es
Ostensoriaos-ten-so-ri-um
Osteocollaos-te-o-col-la
Osteocommaos-te-o-com-ma
Osteogenicos-te-o-gen-ic
Osteoglossidos-te-o-glos-sid
Osteoglossumos-te-o-glos-sum
Osteographyos-te-og-ra-phy
Osteolepidos-te-o-lep-id
Osteolepisos-te-ol-e-pis
Osteolepoidos-te-ol-e-poid
Osteologicos-te-o-log-ic
Osteologicalos-te-ol-o-gy
Osteopathicos-te-op-a-thy
Osteoplasticos-te-o-plas-ty
Osteostracanos-te-os-tra-can
Osteostracios-te-os-tra-ci
Ostomatidaeos-to-mat-i-dae
Ostracodermios-tra-co-der-mi
Ostracophorios-tra-coph-o-ri
Ostreophagousos-tre-oph-a-gous
Otiorhynchidaeoti-o-rhyn-chi-dae
Outmanipulateout-ma-nip-u-late
Ovariotomiesovar-i-ot-o-my
Overaccentuateover-ac-cen-tu-ate
Overanimatedover-an-i-mat-ed
Overapplicationover-ap-pli-ca-tion
Overarticulateover-ar-tic-u-late
5 Syllable WordsSyllables
Overburdeninglyover-bur-den-ing-ly
Overcapacityover-ca-pac-i-ty
Overcapitalizationover-cap-i-tal-ize
Overcommercializationover-com-mer-cial-ize
Overcommunicateover-com-mu-ni-cate
Overcompensateover-com-pen-sa-tion
Overcomplicateover-com-pli-cat-ed
Overconcentratedover-con-cen-tra-tion
Overconscientiousover-con-sci-en-tious
Overconservativeover-con-ser-va-tive
Overcultivationover-cul-ti-va-tion
Overdiagnoseover-di-ag-no-sis
Overeducatedover-ed-u-cat-ed
Overenergeticover-en-er-get-ic
Overenthusiasmover-en-thu-si-asm
Overestimationover-es-ti-ma-tion
Overexaggerateover-ex-ag-ger-ate
Overexpectationover-ex-pec-ta-tion
Overextrapolateover-ex-trap-o-late
Overextravagantover-ex-trav-a-gant
Overexuberantover-ex-u-ber-ant
Overfastidiousover-fas-tid-i-ous
Overgeneralizationover-gen-er-al-ize
Overhomogenizeover-ho-mog-e-nize
Overimaginativeover-imag-i-na-tive
Overindebtedover-in-debt-ed-ness
Overopinionatedover-opin-ion-at-ed
Overorchestratedover-or-ches-trat-ed
Overparticularover-par-tic-u-lar
Overpopulationover-pop-u-la-tion
Overrepresentationover-rep-re-sent-ed
Oversolicitousover-so-lic-i-tous
Overstimulatedover-stim-u-lat-ed
Ovoviviparousovo-vi-vip-a-rous
Oxidimetryox-i-dim-e-try
Oxidizationox-i-di-za-tion
Oxidulatedox-id-u-lat-ed
Oxygenatorox-y-gen-a-tor
Oxyhemoglobinoxy-he-mo-glo-bin
Oxyphenbutazoneoxy-phen-bu-ta-zone
Oxytetracyclineoxy-tet-ra-cy-cline
Ozonificationozo-ni-fi-ca-tion