I am not really sure what you are after, but try this site
https://crossword-solver.org/
Say that you couldn't remember the word "Christmas" but you could remember that it was 9 letters and began with "Ch" and ended in "as"
then type in CH?????AS and t will give you a list of words with those details.
If you can't remember the number of letters either delete one question mark and it will give you 8 letter words, delete 2 and it will give you 7 letter words, add 2 question marks and it will give you 11 letter words etc etc. Then it is just trial and error!