sort by Rank | Alpha
| Possible Meanings | Rank |
| Oregon Heritage Commission | **** |
| Orchard Hill Church | **** |
| Oneida Healthcare Center | **** |
| Office of the High Commission | **** |
| Ohio History Central | **** |
| Ohio Humanities Council | **** |
| Office for Humanities Communication | **** |
| Ohio Heritage Conference | **** |
| Ohio Health Choice | **** |
| Objects Have Class | **** |
| Otto Heubner Centrum | **** |
| Office of HIPAA Compliance | **** |
| Oral History Centre | **** |
| Organisational Health Check | *** |
| Ohio Hispanic Coalition | *** |
| Over Head Camshaft | *** |
| Out of Home Care | *** |
| Oldtimers Hockey Challenge | *** |
| Ocean Hills Church | *** |
| Oxford Haemophilia Centre | *** |
| Oceanic Heat Content | *** |
| Obelisk High Commander | *** |
| Online Hiring Center | *** |
| Omnivore Herbivore Carnivore | *** |
| Operation Healthy Communities | *** |
| Oconee Heritage Center | *** |
| Office of Health Communications | *** |
| Other Health Coverage | *** |
| Occupational Health Clinic | *** |
| Over Head Camera | *** |
| Office for Hispanic Catholics | *** |
| Ouachita Hills College | *** |
| Office of Healthy Communities | *** |
| Onsite Hosting Controller | *** |
| Our High Calling | *** |
| Oak Heritage Conservancy | *** |
| Occupational Health Center | *** |
| Olympia Handball Club | *** |
| Open Handset Coalition | *** |
| Office of Handicapped Concerns | *** |
| Occupational Health Centre | *** |
| occupational health care | ** |
| Oral Health Care | ** |
| Ossein-hydroxyapatite compound | ** |
| outer hair-cell | ** |
| outer horizontal cell | ** |
| outer-hair-cell | ** |
| oxy-halogen compound | ** |
| Olneyville Housing Corporation | ** |
| Oral History Collection | ** |
| oncology home care group | ** |
| of (-)-hydroxycitrate | ** |
| of hydrocortisone acetate | ** |
| Oriole Homes Corp | ** |
| Ohio Health Care | ** |
| Oregon Hop Commission | ** |
| Open Hole Compression | ** |
| Ottawa Honda Club | ** |
| One Happy Customer | ** |
| Occupational Health Counsellors | ** |
| Oklahoma Health Care | ** |
| Occupational Health Committee | ** |
| Ohio Hospitality Coalition | ** |
| Obstructive Hypertrophic Cardiomyopathy | ** |
| Oxygen Hole Centre | * |
| Online Help Conference | * |
| Orthez Handball Club | * |
| Oregon Health Council | * |
| Omaha Healthcare Consortium | * |
| One Hour Challenges | * |
| Optics Hand Controller | * |
| Oregon Hazelnut Commission | * |
| Onboard Hard Copier | * |
| Oxygen Hole Centers | * |
| Old Hawking Club | * |
| Odocoileus Hemionus Cedrosensis | * |
| Office Humanitaire de la CommunautT europTenne | * |
| Office of Housing Coordination | * |
| Old Hickory Coal | * |
| Ontario Hookup Communications | * |
| Opened Heart Cry | * |
| Opened Heart Crystals | * |
| Oregonichthys Hybopsis Cramer | * |
| Organic Hazardous Constituent | * |
| Oswald Hickson Collier | * |
| Other Hazardous Conditions | * |
| Owlnet Hirt and Carter | * |
| Oxbow Hay Company | * |
| Oxnard High Cities | * |