There are 18 10-letter words that start with 'inst'.
| installers | installing | instalment |
| instancies | instancing | instarring |
| instigated | instigates | instigator |
| instillers | instilling | instituted |
| instituter | institutes | institutor |
| instructed | instructor | instrument |
Note: These 18 10-letter words that start with 'inst' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with insta, insti, instr, inste.
6-letter words start with 'inst' (4)