What is the exact number of words in the English language? The current 20-volume Oxford English Dictionary’s second edition contains 171,476 words in use today. That’s a significant amount of money! Which leads to the next question: what is the longest word currently in use that begins with the letter o?

Medicine and chemistry are mentioned in many of the dictionary’s longest words. There are a few defined here, as well as the longest word that begins with the letter o. You might already be using some of these. The ten longest words in the English language, according to Merriam-Webster,

In my ideal daily word game session, I start by picking a comprehensible combination from my stream of consciousness and seeing where that random guess takes me. The game then changes into a linguistic Magic Eye. It’s understandable that some people want to win at all costs. It’s fantastic to keep that daily streak going, especially as it approaches double digits.

It's fantastic to keep that daily streak going, especially as it approaches double digits.

You could always look up the answer to save time, but that doesn’t give you a sense of accomplishment. The only nice middle ground there is gaming words. Starting with a word strategy is the best way to find your comfort zone.

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Which is the longest word that starts with o?

Organophosphorus (an organic compound containing phosphorus) is one of the longest words that begin with the letter O. There are 16 letters in the word.Others include:15 LETTER WORDS

15 LETTER WORDS

objectivization

oxyphenbutazone

overemphasizing

objectification

overglamorizing

overhomogenized

occidentalizing

overcapitalized

overhomogenizes

14 LETTER WORDS

14 LETTER WORDS

we just can learn more of O

overemphasized

overemphasizes

overhomogenize

oxyhaemoglobin

oxyhemoglobins

ovariectomized

overcapitalize

overglamorized

overspecialize

thats the long list to learn

oxymoronically

occidentalized

ophthalmoscopy

overadjustment

overexplaining

overglamorizes

overorganizing

overwhelmingly

occidentalizes

overcentralize

overcompliance

overdramatized

overexcitement

overexploiting

overfertilized

overidealizing

objectlessness

ombudsmanships

omnicompetence

ophthalmologic

ophthalmoscope

overcommitment

overcomplicate

overdramatizes

13 LETTER WORDS

13 LETTER WORDS

objectivizing

objectionably

objectivising

objectivistic

officializing

overcivilized

overbejeweled

overemphasize

oxyhemoglobin

objectionable

objectiveness

overanalyzing

objectivities

ovariectomize

overexpanding

overglamorize

overpackaging

overqualified

occidentalize

oligomerizing

overexcitable

overutilizing

overzealously

ombudsmanship

overdramatize

overexplained

overfertilize

overorganized

oversupplying

ovoviviparity

ophthalmology

optimizations

Outorganizing

12 LETTER WORDS

objectivized

objectivizes

objectifying

objectivisms

outjockeying

overequipped

objectivised

officialized

ozonizations

objectivises

objectivists

officializes

overanalyzed

overclocking

overexplicit

obsequiously

opinionizing

overanalyzes

overexacting

overexciting

overexpanded

overexposing

overpackaged

objurgations

oligomerized

optimization

overbrimming

overcramming

overcropping

overexplains

overorganize

overpackages

oversimplify

11 LETTER WORDS

objectivize

outdazzling

oxygenizing

objectively

objectivism

objectivity

overcomplex

outjockeyed

ozonization

objectified

objectivise

objectivist

officialize

overprizing

objectifies

objurgating

overgrazing

oxidization

objurgatory

overanalyze

overpacking

overpumping

oxyhydrogen

objurgation

organizable

overclocked

overexpands

overexplain

overpackage

obliqueness

obnoxiously

oligomerize

opinionized

Positive Words That Begin With The Letter O

Here is the complete list of positive words that begin with the letter O. There are 165 positive words that begin with the letter O.

  • Oasis
  • Oath
  • Obcordate
  • Obedience
  • Obedient
  • Obediently
  • Obeisance
  • Objective
  • Objectively
  • Obligation
  • Oblige
  • Obliged
  • Obliging
  • Obligingly
  • Observance
  • Observant
  • Observe
  • Obtain
  • Obtainable
  • Occasion
  • Occur
  • Occurrent
  • Odds-on
  • Oecumenical
  • Offer
  • Offering
  • Official
  • Oil-bearing
  • Oily
  • OK
  • Olympiad
  • Olympian
  • Omnicompetent
  • Omnipotent
  • Omnipresent
  • Omniscience
  • Omniscient
  • On-board
  • Oncoming
  • One-liner
  • Oneness
  • Ongoing
  • On-hand
  • On-target
  • On-the-ball
  • On-the-beam
  • On-the-button
  • On-the-money
  • Onward
  • Onwards
  • Oodles
  • Oohlala
  • Oomph
  • Ooze
  • Oozing
  • Opalescent
  • Open
  • Open-handed
  • Open-hearted
  • Open-heartedly
  • Openly
  • Open-minded
  • Openness
  • Operable
  • Operatic
  • Operational
  • Operative
  • Opportune
  • Opportunities
  • Opportunity
  • Optimal
  • Optimism
  • Optimist
  • Optimistic
  • Optimum
  • Opulence
  • Opulent
  • Oracy
  • Orator
  • Orchestrated
  • Order
  • Orderly
  • Organic
  • Organization
  • Organizational
  • Organized
  • Orgasmic
  • Orientation
  • Oriented
  • Original
  • Originality
  • Originate
  • Origination
  • Originative
  • Ornament
  • Ornamental
  • Ornate
  • Orotund
  • Oscar
  • Oscular
  • Osculate
  • Otherworldly
  • Outback
  • Outbalance
  • Outbrave
  • Outclass
  • Outdance