What letters make the sound oot?

There isn't a single combination of letters in English that consistently makes the "oot" sound. The sound is usually spelled with different combinations of vowels, depending on the context and the origin of the word.

Here are some examples:

* oo: "moon," "food," "boot"

* ou: "soup," "group," "route"

* u: "flute," "fruit," "brute"

* ew: "few," "new," "pew"

* ue: "true," "blue," "glue"

The pronunciation of these combinations can vary depending on the dialect and the surrounding letters.