There are no English Scrabble words that meet the criteria. The only word you can make that end with those letters is blank. Here are words you can make with those letters at the beginning of a 7-letter word. blanked, blanker, blanket, blankly
You've provided only 5 letters, but even with 2 blank tiles you can't make a 7-letter word.
Using a blank as the 8th letter, the longest words I can make are 7 letters: carotid, cortina, ricotta, czarist, apricot, chariot, erotica, haricot, carotin
Using all the letters you get: saguaro
Using all the letters you get: climant
There is no 7-letter word using these letters, but there are these two 6-letter words:adroitdiatom
You cannot make any words with seven letters using these letters. The longest word you can make is honda.
There is no nine letter word in English using those letters; you can make the eight letter words hotsauce and cathouse.
carmaker
Mobster.
Special.
ounce,