There are 17 words that start with 'benc'.
| bench | benched | 
| bencher | benches | 
| benchers | benching | 
| benchtop | benchland | 
| benchless | benchmark | 
| benchlands | benchmarks | 
| benchmarked | benchwarmer | 
| benchmarking | benchwarmers | 
| benchmarkings | |
Note: These 17 words that start with 'benc' are found from the USA & Canada version of the tournament Scrabble word list.