Extract word from pdf

good morning, is a beginner in this environment, I would need one help of yours,

  • to Find different words but with the same Character
  • As I can read a file PDF and to extract only some specific words, with a fixed character that is; only the words that are formed from the character Ariel, boldfaced and dimension character 8, without any symbol before, and that the word begins only of the text.

According to you that rule could be used for forming a specific lace.
You would do me a big favor, thanks thousand please if you succeed in giving only also me a small help
I attach an image, because the file pdf is great!