| Word | Definitions | Synonyms |
|---|---|---|
| obtainment | (noun) the act of obtaining | Synonyms: obtention |
| obtention | (noun) the act of obtaining | Synonyms: obtainment |
| obtrusiveness | (noun) an unwelcome conspicuousness | - |
| obturator | (noun) a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate) | - |
| obtuseness | (noun) the quality of lacking a sharp edge or point | - |
| (noun) the quality of being slow to understand | Synonyms: dullness |