There are 13 12-letter words that start with 'inst'.
| installation | installments | instantiated |
| instantiates | instauration | instigations |
| instillation | instillments | institutions |
| instructions | instructress | instrumental |
| instrumented | ||
Note: These 13 12-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)