There are 7 13-letter words that start with 'gla'.
| glaciological | glaciologists |
| glamorization | glamorousness |
| glaringnesses | glassblowings |
| glasspapering | |
Note: These 7 13-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)