- Obsequial Adj.
- Obsequious Adj.
- Observability Subst. Adj.
- Observable Adj. Subst.
- Observance Subst. Adj.
- Observant Adj. Subst.
- Observation Subst. Adj.
- Observational Adj.
- Observatory Subst. Adj.
- Observer Subst. Adj.
- Obsessed Adj. Part. Perf.
- Obsession Subst. Adj.
- Obsessional Adj. Subst.
- Obsessive Adj. Subst.
- Obsidian Subst. Adj.
- Obsidional Adj.
- Obsignatory Adj.
- Obsolescence Subst. Adj.
- Obsolescent Adj.
- Obsolete Adj. Verb
- Obstacle Subst. Adj.
- Obstetric Adj.
- Obstetrical Adj.
- Obstetrician-gynecologist Subst. Adj.
- Obstetrics Subst. Adj.
- Obstinate Adj. Verb
- Obstipated Adj. Part. Perf.
- Obstipating Adj. Subst.
- Obstreperous Adj.
- Obstructed Adj.
- Obstruction Subst. Adj.
- Obstructionist Adj. Subst.
- Obstructive Adj.
- Obstruent Subst. Adj.
- Obtainable Adj.
- Obtrusive Adj.
- Obtundent Adj. Subst.
- Obturative Adj.
- Obturator Subst. Adj.
- Obtuse Adj.
- Obverse Adj. Subst.
- Obviator Subst. Adj.
- Obvious Adj. Subst.
- Obviousness Subst. Adj.
- Obvolute Adj.
- Ocarina Subst. Adj.
- Occasion Subst. Verb Adj.
- Occasional Adj. Subst.
- Occidental Adj. Subst.
- Occidentalist Subst. Adj.
- Occipital Adj. Subst.
- Occipital-frontal Adj.
- Occipital-trigeminal Adj.
- Occipitoanterior Adj.
- Occipitocervical Adj.
- Occipitofacial Adj.
- Occipitofrontal Adj.
- Occipitofrontalis Subst. Adj.
- Occipitomastoid Adj. Subst.
- Occipitomental Adj.