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All Words: om, organism, Ohm, opium, optimism, onanism, odium, ostium, osmium, olm, opprobrium, oafdom, oleum, ostracism, ovum, organicism, officialdom, oscillogram, Oedogonium, Ozonium, oakum, opossum, operculum, optimum, Ornithogalum, overpatriotism, omentum, originalism, officialism, Onosmodium, overwhelm, orthodoxism, oncidium, operationalism, occidentalism, obiism, oneirism, origanum, Onychium, olibanum, ocam, ontologism, oversentimentalism, omasum, obsoletism, overarm, ooecium, oviform, ossuarium, and obscurantism
| Word | Length | Vowels | Syllables | |||
|---|---|---|---|---|---|---|
| Om | 2 | 1 | 1 | 1 | Sanskrit | |
| Organism | 8 | 5 | 3 | 4 | Ancient Greek | |
| Ohm | 3 | 2 | 1 | 1 | ||
| Opium | 5 | 2 | 3 | 3 | Latin | |
| Optimism | 8 | 5 | 3 | 4 | ||
| Onanism | 7 | 4 | 3 | 4 | ||
| Odium | 5 | 2 | 3 | 3 | Latin | |
| Ostium | 6 | 3 | 3 | 3 | ||
| Osmium | 6 | 3 | 3 | 3 | Ancient Greek | |
| Olm | 3 | 2 | 1 | 1 | Old Norse | |
| Opprobrium | 10 | 6 | 4 | 4 | Latin | |
| Oafdom | 6 | 3 | 3 | 2 | ||
| Oleum | 5 | 2 | 3 | 2 | Latin | |
| Ostracism | 9 | 6 | 3 | 4 | Ancient Greek | |
| Ovum | 4 | 2 | 2 | 2 | Latin | |
| Organicism | 10 | 6 | 4 | 5 | ||
| Officialdom | 11 | 6 | 5 | 4 | ||
| Oscillogram | 11 | 7 | 4 | 4 | ||
| Oedogonium | 10 | 4 | 6 | 5 | ||
| Ozonium | 7 | 3 | 4 | 4 | ||
| Oakum | 5 | 2 | 3 | 2 | Middle English | |
| Opossum | 7 | 4 | 3 | 3 | Powhatan | |
| Operculum | 9 | 5 | 4 | 4 | Latin | |
| Optimum | 7 | 4 | 3 | 3 | New Latin | |
| Ornithogalum | 12 | 7 | 5 | 5 | ||
| Overpatriotism | 14 | 8 | 6 | 7 | ||
| Omentum | 7 | 4 | 3 | 3 | ||
| Originalism | 11 | 6 | 5 | 6 | ||
| Officialism | 11 | 6 | 5 | 5 | ||
| Onosmodium | 10 | 5 | 5 | 5 | ||
| Overwhelm | 9 | 6 | 3 | 3 | Middle English | |
| Orthodoxism | 11 | 7 | 4 | 5 | ||
| Oncidium | 8 | 4 | 4 | 4 | ||
| Operationalism | 14 | 7 | 7 | 7 | ||
| Occidentalism | 13 | 8 | 5 | 6 | ||
| Obiism | 6 | 3 | 3 | 4 | ||
| Oneirism | 8 | 4 | 4 | 4 | ||
| Origanum | 8 | 4 | 4 | 4 | Ancient Greek | |
| Onychium | 8 | 5 | 3 | 4 | ||
| Olibanum | 8 | 4 | 4 | 4 | Medieval Latin | |
| Ocam | 4 | 2 | 2 | 2 | ||
| Ontologism | 10 | 6 | 4 | 5 | ||
| Oversentimentalism | 18 | 11 | 7 | 8 | ||
| Omasum | 6 | 3 | 3 | 3 | Latin | |
| Obsoletism | 10 | 6 | 4 | 5 | ||
| Overarm | 7 | 4 | 3 | 3 | ||
| Ooecium | 7 | 2 | 5 | 4 | New Latin | |
| Oviform | 7 | 4 | 3 | 3 | Latin | |
| Ossuarium | 9 | 4 | 5 | 5 | Latin | |
| Obscurantism | 12 | 8 | 4 | 5 | Latin |
Prefix: o-. Suffix: -m. List of words that begin like o / start with o and end with m.
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