For information on how to use procedure parameters, please read
http://www.appinventor.org/bookChapters/chapter21.pdf
from the free book in
I imagine you would call this procedure from your newgame procedure ...
but I see you blanking out the text in your buttons there, so I may have a different idea from yours as to when the text should appear in the buttons.
I imagined from your question that the game play involved having the buttons show words, and asking the player to click two buttons showing words that are synonyms to each other, then if they match as synonyms, blank them out.
By the way, global variables should have specific names telling what they hold, like student_names_list, my_teachers_list, etc.