There are 13 12-letter words that start with 'gu'.
| guanethidine | guaranteeing | guardianship |
| guesstimated | guesstimates | guilefulness |
| guillotining | guiltinesses | guitarfishes |
| gunslingings | gunsmithings | guttersnipes |
| gutturalisms | ||
Note: These 13 12-letter words that start with 'gu' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with gui, gua, gun, gul, gum, gut, gus, gue, gur, guy, gud, guf, gug, guz, guc, gup, guv, gub.
3-letter words start with 'gu' (6)