With 37,807 10-letter words in our various dictionaries it is much easier than you think to unscramble words from a mix of letters.
However, that does depend upon the letters that you have available. Because, there are no 10-letter words that end with J, Q or V in any of our dictionaries. If you have a B, a U or a Z then your options are also limited to find words. They have 7, 6, and 1 words respectively – RAZZMATAZZ being my favourite.
At the complete other end of the scale, there are a total of 15,885 10-letter words ending with S. Obviously, many of these are plurals like CATEGORIES, CONDITIONS, ACTIVITIES or FACILITIES. However, there is also the occasional word like REGARDLESS or INDIGENOUS that is not a plural of another word.