There are 12 words that start with 'lobst'.
| lobster | lobsters | lobstick | 
| lobstered | lobsterer | lobsticks | 
| lobsterers | lobstering | lobsterman | 
| lobstermen | lobsterings | lobsterlike | 
Note: These 12 words that start with 'lobst' are found from the USA & Canada version of the tournament Scrabble word list.