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All Words: one, on, OR, op, os, out, own, once, ow, ox, om, old, off, oy, of, OD, owl, oe, oil, oat, oink, OH, oi, oak, oud, oar, Ops, Ouse, ought, orb, oof, oath, our, oaf, OMB, ont, Ohm, odd, owe, obsessed, opt, oft, Orr, oats, oast, ounce, OED, OIS, Oct, and OAS
| Word | Length | Vowels | Syllables | |||
|---|---|---|---|---|---|---|
| One | 3 | 1 | 2 | 1 | Middle English | |
| On | 2 | 1 | 1 | 1 | Middle English | |
| OR | 2 | 1 | 1 | 1 | ||
| Op | 2 | 1 | 1 | 1 | Dutch | |
| Os | 2 | 1 | 1 | 1 | Latin | |
| Out | 3 | 1 | 2 | 1 | Old English | |
| Own | 3 | 2 | 1 | 1 | Middle English | |
| Once | 4 | 2 | 2 | 1 | Middle English | |
| Ow | 2 | 1 | 1 | 1 | ||
| Ox | 2 | 1 | 1 | 1 | Old English | |
| Om | 2 | 1 | 1 | 1 | Sanskrit | |
| Old | 3 | 2 | 1 | 1 | Middle English | |
| Off | 3 | 2 | 1 | 1 | ||
| Oy | 2 | 1 | 1 | 1 | Yiddish | |
| Of | 2 | 1 | 1 | 1 | Middle English | |
| OD | 2 | 1 | 1 | 1 | ||
| Owl | 3 | 2 | 1 | 1 | Middle English | |
| Oe | 2 | 0 | 2 | 1 | Danish | |
| Oil | 3 | 1 | 2 | 1 | Middle English | |
| Oat | 3 | 1 | 2 | 1 | Middle English | |
| Oink | 4 | 2 | 2 | 1 | ||
| OH | 2 | 1 | 1 | 1 | ||
| Oi | 2 | 0 | 2 | 1 | ||
| Oak | 3 | 1 | 2 | 1 | Middle English | |
| Oud | 3 | 1 | 2 | 1 | Arabic | |
| Oar | 3 | 1 | 2 | 1 | Old English | |
| Ops | 3 | 2 | 1 | 1 | ||
| Ouse | 4 | 1 | 3 | 1 | ||
| Ought | 5 | 3 | 2 | 1 | Old English | |
| Orb | 3 | 2 | 1 | 1 | French | |
| Oof | 3 | 1 | 2 | 1 | French | |
| Oath | 4 | 2 | 2 | 1 | Middle English | |
| Our | 3 | 1 | 2 | 1 | Middle English | |
| Oaf | 3 | 1 | 2 | 1 | Old Norse | |
| OMB | 3 | 2 | 1 | 1 | ||
| Ont | 3 | 2 | 1 | 1 | Old Norse | |
| Ohm | 3 | 2 | 1 | 1 | ||
| Odd | 3 | 2 | 1 | 1 | Middle English | |
| Owe | 3 | 1 | 2 | 1 | Middle English | |
| Obsessed | 8 | 5 | 3 | 1 | ||
| Opt | 3 | 2 | 1 | 1 | French | |
| Oft | 3 | 2 | 1 | 1 | Middle High German | |
| Orr | 3 | 2 | 1 | 1 | ||
| Oats | 4 | 2 | 2 | 1 | ||
| Oast | 4 | 2 | 2 | 1 | ||
| Ounce | 5 | 2 | 3 | 1 | Middle French | |
| OED | 3 | 1 | 2 | 1 | ||
| OIS | 3 | 1 | 2 | 1 | ||
| Oct | 3 | 2 | 1 | 1 | ||
| OAS | 3 | 1 | 2 | 1 |
This should be the most accurate and largest monosyllable words list in the English language.
Prefix: o-. List of words that begin like o / start with o.
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