There are 13 words that start with 'unkno'.
| unknot | unknots |
| unknown | unknowns |
| unknotted | unknowing |
| unknotting | unknowable |
| unknowings | unknowingly |
| unknowability | unknowabilities |
| unknowledgeable | |
Note: These 13 words that start with 'unkno' are found from the USA & Canada version of the tournament Scrabble word list.