There are 16 words that start with 'coagu'.
| coagula | coagulum | 
| coagulant | coagulase | 
| coagulate | coagulums | 
| coagulable | coagulants | 
| coagulases | coagulated | 
| coagulates | coagulating | 
| coagulation | coagulations | 
| coagulability | coagulabilities | 
Note: These 16 words that start with 'coagu' are found from the USA & Canada version of the tournament Scrabble word list.