The 10-letter word you can make with the letters "caaaussntl" is "casualsant." However, it appears there may be a misunderstanding as this specific combination may not yield a standard word in English. Instead, you can rearrange the letters to form "casuals" and "tantalus," but neither is a single 10-letter word.
Using all the letters you get: climant
Using all the letters you get: saguaro
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.
Yes, you can make the five-letter word "early" using the letters y, r, e, l, and a.
There is no nine letter word in English using those letters; you can make the eight letter words hotsauce and cathouse.
There is no seven-letter word in the English language using those letters.
Samba is the only 5 letter word you can make with those letters
Five letter words that can be made from those letters are vodka and goads.
carmaker
Mobster.
Special.