There are 9 words that start with 'precom'.
| precompute | precomputed |
| precomputer | precomputes |
| precomputing | precombustion |
| precommitment | precombustions |
| precommitments | |
Note: These 9 words that start with 'precom' are found from the USA & Canada version of the tournament Scrabble word list.