- Oregonian Adj Noun Pnoun
- Oreophyte Noun Adj
- Orepass Noun Adj
- Orexis Noun
- Orf Noun Adj
- Organ Noun Adj
- Organdie Noun Adj
- Organdy Noun Adj
- Organelle Noun Adj
- Organic Adj Noun
- Organicism Noun
- Organicist Noun Adj
- Organics Noun Adj
- Organification Noun
- Organigram Noun Adj
- Organisation Noun Adj
- Organiser Noun Adj
- Organising Noun Pres. Participle
- Organism Noun Adj
- Organist Noun Adj
- Organizability Noun
- Organization Noun Adj
- Organizer Noun Adj
- Organizing Noun Pres. Participle
- Organoalkali Noun Adj
- Organoaluminum Noun Adj
- Organoarsenic Adj Noun
- Organoberyllium Noun Adj
- Organobismuth Noun Adj
- Organoboron Noun Adj
- Organocadmium Noun Adj
- Organocalcium Noun Adj
- Organochlorine Adj Noun
- Organocopper Noun Adj
- Organogel Noun Adj
- Organogen Noun
- Organogenesis Noun
- Organogeny Noun
- Organogermanic Adj Noun
- Organogold Noun Adj
- Organography Noun
- Organohalogen Noun Adj
- Organoid Noun Adj
- Organolead Adj Noun
- Organolithium Noun Adj
- Organologist Noun Adj
- Organology Noun
- Organomagnesium Noun Adj
- Organomegaly Noun
- Organomercurial Adj Noun
- Organomercuric Adj Noun
- Organomercury Noun Adj
- Organometallic Adj Noun
- Organon Noun Pnoun
- Organopathology Noun
- Organopexy Noun Adj
- Organophobicity Noun
- Organophosphate Noun Adj
- Organophosphorus Adj Noun
- Organoplasty Noun