- Opacify Verb Part. Perf.
- Opalesce Verb
- Opaque Adj. Subst. Verb
- Ope Inter. Verb Part. Perf.
- Open Adj. Subst. Verb Adv.
- Open along Verb
- Open around Verb
- Open back Verb
- Open down Verb
- Open in Verb
- Open off Verb
- Open on Verb
- Open out Verb
- Open over Verb
- Open up Verb
- Opencast Adj. Subst. Verb
- Operate Verb
- Operate along Verb
- Operate around Verb
- Operate in Verb
- Operate off Verb
- Operate on Verb
- Operate over Verb
- Operate under Verb
- Operationalise Verb
- Operationalize Verb
- Ophthalmoscope Subst. Verb
- Opiate Adj. Subst. Verb
- Opine Verb
- Opportune Adj. Verb
- Oppose Verb Part. Präs. Part. Perf. Subst.
- Oppress Verb
- Oppugn Verb Part. Perf. Part. Präs.
- Opsonize Verb
- Opt Verb
- Opt in Verb
- Opt out Verb
- Optate Verb
- Optimise Verb
- Optimize Verb
- Option Subst. Verb Adj.
- Oracle Subst. Verb Eigenn. Adj.
- Orange Adj. Subst. Verb
- Orate Verb
- Orb Subst. Verb Adj.
- Orbit Subst. Verb Adj. Part. Präs. Part. Perf.
- Orchestrate Verb Part. Perf. Part. Präs.
- Ordain Verb
- Ordeal Subst. Verb
- Order Subst. Verb Adj. Part. Perf.
- Ordinate Adj. Subst. Verb
- Organise Verb
- Organize Verb
- Organize around Verb
- Organized Adj. Part. Perf. Verb
- Orgasm Subst. Verb Adj.
- Orient Subst. Verb Adj. Eigenn.
- Orientalise Verb
- Orientalize Verb
- Orientate Verb Part. Perf. Part. Präs.