The word "discovering" refers to the act of finding out or coming across something new or unknown. Its antonym is "losing", which means to no longer have or be able to find something that was previously available. Another antonym for discovering is "concealing", which means to hide or keep something secret from others. "Suppressing" is also an antonym, which means to prevent something from being revealed or expressed. Lastly, "obscuring" is an antonym for discovering, which means to make something more difficult to see or understand.