sort by Rank | Alpha
| Possible Meanings | Rank |
| Outward Bound Australia | ***** |
| Offshore Banking Act | **** |
| Octave Band Analysis | **** |
| Office of Business Administration | **** |
| Ontario Bar Association | **** |
| Old Boys Association | **** |
| Oregon Bankers Association | **** |
| Oregon Bioscience Association | **** |
| Office of Business Assistance | **** |
| Online Business Alliance | **** |
| Of the Bondsman | *** |
| Optical Brightening Agents | *** |
| Oklahoma Bankers Association | *** |
| Office of Black Affairs | *** |
| Ostschweizer Bildungs Ausstellung | *** |
| Opponents Batting Average | *** |
| Ohio Building Authority | *** |
| Open Business Accounting | *** |
| Ontario Baseball Association | *** |
| Old Bostonian Association | *** |
| Office of Budget and Analysis | *** |
| Office Based Anesthesia | *** |
| Optical Brightener Agent | *** |
| Order of Battle | *** |
| Oregon Business Association | *** |
| oxfordshire bridge association | *** |
| Oklahoma Bandmasters Association | *** |
| Of Blues Archive | *** |
| 2-(oxalylamino)-benzoic acid | ** |
| ors binding activity | ** |
| Ors-binding activity | ** |
| orthodontic bonding area | ** |
| otogenic brain abscess | ** |
| oxidative burst activation | ** |
| Own on Board Air | ** |
| Ontario Beekeeepers Association | ** |
| Outdoor Basketball Association | ** |
| opioid blockade-induced analgesia | ** |
| Optical Bench Assembly | ** |
| Object Based Automation | ** |
| Oregon Biosciences Association | ** |
| Office Business Assistant | ** |
| Ole Bull Akademiet | ** |
| Omaha Bar Association | ** |
| Occidental Business Associates | ** |
| dolichos biflorus agglutinin | ** |
| Office of Business Analysis | ** |
| Office Based Apps | ** |
| Ogden Beeman Associates | ** |
| Oregon Bamboo Association | ** |
| Oklahoma Banker Archive | ** |
| Office of the Business Advocate | ** |
| Outsourcing Benchmarking Association | ** |
| Orleans Business Association | ** |
| Ohio Bankers Association | ** |
| Oxalylamino Benzoic Acid | ** |
| Oceanic Boxing Association | ** |
| Online Banking Association | ** |
| Overland Business Association | ** |
| Of the Bank Act | ** |
| Office of Biotechnology Affairs | ** |
| Off Board Artillery | ** |
| Operational Balancing Agreements | ** |
| Oriental Building Association | ** |
| Office of Bougainville Affairs | ** |
| One Block Ahead | ** |
| Oceanside Business Association | ** |
| Old Brutonian Association | ** |
| Ohio Breastfeeding Alliance | ** |
| Overslag Bedrijf Amsterdam | ** |
| Ohio Bowhunters Association | ** |
| Orthodontic Bracket Adhesive | ** |
| Out of Band Announcement | ** |
| Office of Biological Activities | * |
| Offshore Bankers Association | * |
| Ohio Bursars Association | * |
| Ordo Baptismi Adultorum | * |
| orca bay aviation | * |
| One Breath Away | * |
| Open by Appointment | * |
| Optical Bench Assy | * |
| Oklahoma Bandmaster Association | * |
| Office of Brownfield Assistance | * |
| Operator Balancing Agreement | * |
| Olga Bay Alaska | * |
| Office of Budget and Administration | * |
| Office of Business Affairs | * |
| Olympic Body Artimmortilize | * |
| Open Billing Arrangement | * |
| Open Building Architecture | * |
| Operational Buoys in the Atlantic | * |
| Oxford Bookshop Atlases | * |