There are 12 12-letter words that start with 'gla'.
| glaciologies | glaciologist | gladiatorial |
| gladsomeness | glamourizing | glassblowers |
| glassblowing | glassinesses | glassmakings |
| glasspapered | glassworkers | glaucousness |
Note: These 12 12-letter words that start with 'gla' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with glas, glad, glam, glac, glan, glaz, glai, glar, glau, glab.
4-letter words start with 'gla' (2)