There are 12 words that start with 'brains'.
| brains | brainsick |
| brainstem | brainstems |
| brainstorm | brainsickly |
| brainstorms | brainstormed |
| brainstormer | brainstormers |
| brainstorming | brainstormings |
Note: These 12 words that start with 'brains' are found from the USA & Canada version of the tournament Scrabble word list.