There are 4 14-letter words that start with 'gas'.
| gastightnesses | gastroduodenal |
| gastroscopists | gastrovascular |
Note: These 4 14-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)