There are 15 12-letter words that start with 'deca'.
| decalcifying | decalcomania | decantations |
| decapitating | decapitation | decapitators |
| decarbonated | decarbonates | decarbonized |
| decarbonizer | decarbonizes | decarburized |
| decarburizes | decasyllabic | decasyllable |
Note: These 15 12-letter words that start with 'deca' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with decar, decal, decap, decam, decan, decad, decay, decag, decas, decat, decaf, decah.
5-letter words start with 'deca' (3)