There are 15 11-letter words that start with 'gas'.
| gasconaders | gasconading | gaseousness |
| gassinesses | gastrectomy | gastritides |
| gastritises | gastroliths | gastronomes |
| gastronomic | gastroscope | gastroscopy |
| gastrotrich | gastrulated | gastrulates |
Note: These 15 11-letter words that start with 'gas' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with gast, gaso, gass, gash, gasi, gasp, gasc, gase, gask, gasl, gasa, gasb, gasm, gasw.
4-letter words start with 'gas' (3)