How to play crossword puzzle? (similar to lotto, bingo.. to win money..)?

My grandma got a 50x multiplier on her card and she got 2 words. I read on the back that you must contain at least 3 letters to make a word. I found 2 more words within other lines, but not completing the word. For example, my grandma didn't complete "vagabond" but I found the word "bond" in it within the letters she has. I also found "Quit" from "Quite"

Can she play like this or does she have to complete the whole word?