Using all the letters you get Hermione
The maximum sized word you can make from those letters is 6 letters.
"HISTORY:
uplinks
You cannot make any words with seven letters using these letters. The longest word you can make is honda.
The longest word is 6 letters: rudely
There is no English word that uses all nine of those letters. Here's the largest English word you can make with those letters (7 letters): plastic
routine(s)
suites-that;s odd, six letter word, 7 letters tissue (or even tissues with the 7 letters)
You cannot make any seven letter words with these letters. The longest word you can make is auto.
Using all the letters you get: saguaro
Using all the letters you get: climant
Usurers