There are 17 words that start with 'disca'.
| discant | discard | discase | 
| discants | discards | discased | 
| discases | discalced | discanted | 
| discarded | discarder | discasing | 
| discanting | discarders | discarding | 
| discarnate | discardable | |
Note: These 17 words that start with 'disca' are found from the USA & Canada version of the tournament Scrabble word list.