What's the difference between a kushiya (קוּשְׁיָא) and a teyuvta (תְּיוּבְתָּא)? TB Ketubot 41

Both a kushiya (קוּשְׁיָא) and a teyuvta (תְּיוּבְתָּא) signify a problem in somebody’s argument. What's the difference between a kushiya (קוּשְׁיָא) and a teyuvta (תְּיוּבְתָּא)?

The term kushiya, just highlights a problem in somebody’s argument. Nevertheless, that person’s argument is not completely rejected. It just means that there’s a problem in that person’s line of thought. A teyuvta signifies a severe problem in the person’s methodology to the extent that it is a conclusive refutation the person’s position.

That’s why the Gemara and we are surprised when comes to the conclusion on TB Ketubot 41 “This is a conclusive refutation of the opinion of Rav Huna, son of Rav Yehoshua, that payment of half the damage is a fine. The Gemara further concludes: And the halakha is that payment of half the damage is a fine. The Gemara asks: Is there a conclusive refutation (תְּיוּבְתָּא)  of the opinion of Rav Huna, son of Rav Yehoshua, and the halakha is in accordance with that opinion?” (Sefaria.org translation)

An answer is “yes.”