all answers should be displayed
in small text, under the "You are Correct", there should be a section where you see the most common answers [other than what you typed], and maybe an expandable section with potential answers. Most of the time, the answers are very similar, but languages have ambiguity (e.g.: boyfriend or girlfriend in Norwegian is kjæreste eller kjæreste, the same word), and it's nice to see that you could of typed in the other word and still got it right.
There could be many correct answers. The one given is the one which the team creators consider the best one, and showing all correct answers could be confusing, especially if some of them are from another dialect.
I suggested this a while ago and was told that there are too many correct answers. I also believe I suggested that if there are too many correct answers that the most common or important ones should be listed. Glad someone else feels the same.
I seem to remember being downvoting when I made the suggestion.