Champ 
Chassis 
concentric hemispherical analyzer 
California Healthcare Association 
Canadian Hockey Association 
Catholic Health Association 
chemical hamiltonian approach 
Click Here Asshole 
Concept Hazard Analysis 
Controlled Hunting Area 
calcium hydroxyapatite 
Call Hold with Announcement 
Cambodian Handicraft Association 
Canadian Healthcare Association 
Canadian Historical Association 
Canadian Hydrographers Association 
Canadian Hyperlexia Association 
Canine Hydrotherapy Association 
Capitol Heights Academy 
Carbonate hydroxyapatite 
carbonate-containing hydroxyapatite 
Carbonated hydroxyapatite 
carbonate-substituted hydroxyapatite 
Caribbean Hotel Association 
Caribbean Hotels Association 
Cask Handling Area 
Catholic Health Association, Australia 
Cell-bound haemagglutinin 
Central Flying Service 
Central Hinds Academy