Unfortunately, none in the English language. The largest word with IIVAU, is VIA and with the T added, it's VITA or VATU. There are none with 5 letters.
One word that fits your criteria is "distant." It starts with the letter 'd,' ends with 't,' and contains seven letters.
The seven-letter word you're looking for is "sentences." It contains the words "sent," "ten," "tense," "cents," "cent," "sec," and "s." Each of these can be found within the letters of the word itself.
6 letters are in the word letter.
The word that can be made using the letters in "epailcs" is "special." This word contains all the letters given and is a common English word.
The singular possessive form of letter is letter's. The plural of letter is letters. The plural possessive of letters is letters'
A fifteen letter word that contains the letters atragiclostnoun is congratulations!!!
The word is fetid.
Leather
Copters
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Cheetah
The word possibly is an 8-letter word that contains the letter B.
Euphemism.
babes
Traditions, iterations
seduces