Write a function called find_possible_words() that finds all the words that can be made from a provided list of letters. Use the dictionary.txt file that contains a list of words. Your function should have two parameters:

• letter_list: a list of letters from which a word could be built.
• dictionary_file: set as default to dictionary.txt.

You can use two already implemented functions: can_build_word() and get_dictionary_words().