There are 12 words that start with 'exoc'.
| exocarp | exocarps | exocrine | 
| exocytic | exocrines | exocyclic | 
| exocytose | exocytosed | exocytoses | 
| exocytosis | exocytotic | exocytosing | 
Note: These 12 words that start with 'exoc' are found from the USA & Canada version of the tournament Scrabble word list.