| Text | Length |
| On one's guard | 18 |
| Opening for Romeo? | 18 |
| One-time ring king | 18 |
| Old foe of Frazier | 18 |
| Other things: Lat. | 18 |
| Otherwise known as | 18 |
| One may assume one | 18 |
| Out of this world? | 18 |
| Outsider of a sort | 18 |
| Otherworldly types | 18 |
| Others, to Octavia | 18 |
| Of the same stripe | 18 |
| One of a gene pair | 18 |
| Order in the court | 18 |
| Outstanding player | 18 |
| Opera singer Gluck | 18 |
| Over the length of | 18 |
| One of the Julians | 18 |
| Of Swiss mountains | 18 |
| Old, in Oberhausen | 18 |
| Old woman, in Bonn | 18 |
| Old one, in German | 18 |
| Old one, in Aachen | 18 |
| Old man, in Munich | 18 |
| Org. of physicians | 18 |
| Org. for an OB/GYN | 18 |
| Oriental nursemaid | 18 |
| Oriental housemaid | 18 |
| One of a love trio | 18 |
| One-time Jeep mfr. | 18 |
| One-celled critter | 18 |
| One-cell creatures | 18 |
| One kind of corner | 18 |
| Open to suggestion | 18 |
| One of the Leagues | 18 |
| Old-fashioned folk | 18 |
| Opposite of hatred | 18 |
| Ordnance component | 18 |
| One-celled swimmer | 18 |
| One-celled animals | 18 |
| One way not to run | 18 |
| One bad way to run | 18 |
| Old Testament book | 18 |
| One of the Alcotts | 18 |
| OT book after Joel | 18 |
| Old name of Xiamen | 18 |
| One for the roadie | 18 |
| Occupy pleasurably | 18 |
| One of the Irvings | 18 |
| Orange County city | 18 |
| One who adds color | 18 |
| Organ study: Abbr. | 18 |
| Of the body: abbr. | 18 |
| Object of loathing | 18 |
| One of the Muppets | 18 |
| O'Day or Baker | 18 |
| Old Egyptian cross | 18 |
| Oft-sprained joint | 18 |
| One of the Romneys | 18 |
| Obama's mother | 18 |
| Oakley the deadeye | 18 |
| Orphan girl et al. | 18 |
| Of some electrodes | 18 |
| Of a cell terminal | 18 |
| Oft-quoted author? | 18 |
| Opposite of a syn. | 18 |
| Opposition leader? | 18 |
| Obstructing, maybe | 18 |
| Opposition members | 18 |
| Octavian's foe | 18 |
| One or more prefix | 18 |
| One way to the WWW | 18 |
| Owner of Moviefone | 18 |
| One way to the Web | 18 |
| Of the first water | 18 |
| One from the heart | 18 |
| Of the main artery | 18 |
| On different sides | 18 |
| Orangutan, for one | 18 |
| Orangutan or chimp | 18 |
| Orbital high point | 18 |
| Overseas addresses | 18 |
| One ramming fruit? | 18 |
| Oratory projection | 18 |
| Oil-rich peninsula | 18 |
| Old name for Syria | 18 |
| Old bridge feature | 18 |
| Old English forest | 18 |
| Of the verb, to be | 18 |
| Of the verb to be | 18 |
| Oracle, in Oakland | 18 |
| Old Trafford, e.g. | 18 |
| Odeum, for example | 18 |
| Olympus inhabitant | 18 |
| Olympian warmonger | 18 |
| Olympian aggressor | 18 |
| Oscar-winning film | 18 |
| Odysseus's dog | 18 |
| Onassis, to Jackie | 18 |
| Onassis, for short | 18 |
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