what starts with a t ends with a t and is full of t.

teapot

to answer the questen

The word that starts with a "t," ends with a "t," and is full of "t" is "teapot."

Explanation:
To find the answer to this riddle, we need to look for a word that starts and ends with the same letter, "t," and contains the letter "t" multiple times. One possible word that fits this description is "teapot."