Use "?" for one missing letter: pu?zle. Use "*" for any number of letters: p*zle. Or combine: cros?w*d
Select number of letters in the word, enter letters you have, and find words!
It is described in detail in Lovecraft's novella The Dream-Quest of Unknown Kadath (1926) Then two pink eyes shone, and the head of the awakened gug sentry, large as a barrel, wabbled into view. — “Underworld (Dreamlands) - Wikipedia, the free encyclopedia”, en.wikipedia.org