Possible answers that came to mind, without doing a lot of work, were GREAT, GRATE, PRATE, TREAT. Lots of remaining guesses, so I didn't bother with using an elimination word. Since half the options started with G, I decided I would use either GRATE or GREAT. I decided GRATE, because if GRATE was wrong, it would indicate which of the other three words would be the correct answer.
[added comment] I see that I overlooked CRATE as a possible answer. Which means that if GRATE showed the solution was xRATE, there still would have been two possible answers.
[more added comment] I also overlooked IRATE as a possible answer.